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The characters of Oz, fictional characters on the television series about prison life, are a diverse mixture of inmates from various gangs and prison staff.

Cast timeline

  Main cast ("Starring" in opening credits)

  Secondary cast ("Also starring" in opening credits)

  Recurring guest star (Guest starring for 3+ episodes)

  Guest star (Guest starring for 1–2 episodes)

Main inmates

Key

Other inmates

The Aryans

The Aryans are a fierce gang. Led through the whole series by the charismatic Vernon Schillinger. They are racist, nationalist, tough and like to have what are known in the series as "Prags" (The show's term for a "Bitch"). They, and mostly Schillinger himself, take up most of the Oz rape statistic. Curiously they rarely have feuds with the Homeboys but rather with the Muslims. The Aryans were in a perpetual alliance with the Bikers, had a CO on their "payroll," and were a force to be reckoned with.

• Mark Mack (Leif Riddell, Seasons 1-2) – An inmate in Emerald City and Schillinger's lieutenant. He helps Schillinger murder Vogel and later rapes Hanlon. When he discovers Busmalis' tunnel, he forces them to switch cells and attempts to escape through the tunnel. He and a fellow escaping inmate are killed when the tunnel collapses on top of them.
• Andrew Schillinger (Frederick Koehler, Seasons 1, 3, 6) – Eldest son of Vernon Schillinger. He originally shares his father's white supremacist views, though not his intolerance of drugs. He is sent to Em City and rooms with Beecher. Beecher, Keller and O'Reily see this as an opportunity to get back at Schillinger. Beecher recognizes him as a fellow victim of Schillinger and helps him off heroin, in the process turning him against his father. Andrew eventually denounces the Aryan ideals to his father, attacks him and is sent to the hole. Schillinger has Lopresti bring him a lethal amount of heroin and after some reluctance, Andrew takes the drugs and overdoses. Despite the 'success' of their plan, Beecher shows considerable remorse for his part in Andrew's death.
• Fred Wick (Chazz Menendez, Seasons 1-4) – A background Aryan, often seen antagonizing other inmates such as Beecher and O'Reily. He also sponsors Andrew Schillinger. He participates in the drug trial and suffers a fatal side effect in the middle of a conversation with Hoyt. His family subsequently sue the prison.
• Mark Miles (Michael Quill, Season 4) – An inmate on Death Row. His Aryan views mean he is unwilling to befriend the other inmates on Death Row: Deyell (black) and Ginzberg (gay). He is a talented artist and paints a self-portrait on his cell wall. His repeated abuse of neighbouring inmate Deyell leads Deyell to dig through the cell wall between them, finally breaking through and strangling Miles to death, destroying the portrait in the process.
• Carl Jenkins (Joshua Harto, Season 4) – A young inmate tasked with murdering Saïd, he instead kills Leroy Tidd and is sent to solitary. Cloutier visits him and attempts to get him to confess to Robson's involvement. The Brotherhood finds out and threatens him, causing him to hang himself in his cell.
• Franklin Winthrop (Andy Powers, Seasons 5-6) – A friend of Adam Guenzel's. He is sent to Unit B and quickly becomes a prag of the Aryans and is forced to wear women's clothes and makeup. However, he strives to move up the ranks and is accepted as a full member after he murders Beecher's father. Keller realises his crime and seduces him, before snapping his neck.

The Bikers

The Bikers are, for the most part, some of the toughest inmates. They are also Schillinger and the other Aryans' allies and as such, share at least some of his thoughts on race, religion, etc. Jaz Hoyt is their leader.

• Scott Ross (Stephen Gevedon, Season 1) – A friend of Whittlesey's ex-husband and Schillinger. He transfers into Em City, where he also befriends O'Reily. He starts a cigarette racket with Whittlesey and threatens her when she tries to break it off. During the riot, he shoots McManus but is then murdered by Whittlesey. Despite several other people discovering her crime, it is covered up and Whittlesey is never punished for his murder.
• Jaz Hoyt (Evan Seinfeld, Seasons 2-6) – The leader of the Bikers for the majority of the series. Despite his brutality, he suggests inmates raise money to send Rebadow's grandson to Disney World. He is not particularly bright and is often manipulated by other inmates, most commonly O'Reilly. He tries to kill Stanislofsky over Galino's cellphone, orchestrates Cloutier's imprisonment in the kitchen wall and kills Burns in self-defense when Burns tries to kill Kirk. Hoyt then receives a vision from Cloutier, telling him to kill Kirk. Though Kirk survives this attempt, Hoyt is haunted by Cloutier and confesses to a series of other murders, resulting in his transfer to Death Row. Once there, he finally kills Kirk but immediately goes insane and his death sentence is commuted. On the eve of his transfer to a mental hospital, he is killed by another biker.
• Jim Burns (Peter James Kelsch, Seasons 2-5) – A background character in seasons two and three, he takes more prominence in season four when he is converted by Cloutier. He and Kirk try to convert other inmates by force. After Kirk is exiled by Cloutier and Cloutier is injured by the kitchen blast, he sees a vision of Cloutier, telling him to kill Kirk. He tries, and is killed by Hoyt in the process.
• Max Sands (Mike Arotsky, Seasons 4-6) – Another background biker, he often seen alongside Hoyt, but after Hoyt confessed all of his murders that he was never found guilty with before, he took the role in the gang as leader, helping lure Guenzel into one of Schillinger's traps of sexual assault.

The Christians

The Christians are perhaps the most quiet of all the groups in Oz, but they get a voice when Jeremiah Cloutier entered the fold. Cloutier converted Biker Jim Burns and got close to Vern Schillinger, but unfortunately these connections proved fatal when he banished Timmy Kirk from his congregation. Timmy Kirk was using the flock to extort and punish inmates he considered wicked, but was indeed wicked himself, and eventually turned to Satanism before finally being killed by Jaz Hoyt on his second attempt. Other notable members include William Cudney, who shot the child of a doctor who had aborted his wife's fetus, and Robert Sippel, a pedophile priest, who was eventually nailed by Schillinger and the Aryans.

• Jonathan Coushaine (Bryan Callen, Season 2) – A former teacher, he is appointed the teacher for Em City's short-lived GED program. He clashes frequently with Wangler in his attempts to educate him.
• Robert Sippel (David Lansbury, Season 2) – A former priest imprisoned for child molestation, he is paroled and finds life on the outside difficult. He moves back into Oz because he cannot find housing or a job, so Mukada hires him as an assistant. Shortly after, he is crucified to the gym floor by the Aryans.
• William Cudney (William Cote, Season 3) – Serving life without parole for killing the child of a doctor who performed an abortion on Cudney's partner (reasoning a child's life for a child's life). He and the other Christian inmates in Em City try to stop the inmates from watching Miss Sally's Schoolyard, since they are only interested in her breasts. He steals drugs from the hospital for O'Reily but later decides to turn them both in. O'Reily quickly hires Kosygin to murder him and Cudney bleeds out after being stabbed in the neck.
• Vincent (Vincent D'Abouze) – A young, attractive black man, who is sponsored by Adebisi. During Querns tenure, all of the Christian inmates besides Vincent are transferred out of Em City. Adebisi then dominates Vincent, forcing him to wear ladies clothing and dance for him.
• Jeremiah Cloutier (Luke Perry, Seasons 4-6) – A former televangelist preacher, arrested for stealing from his church. He initially engages in a battle for the souls of Oz's inmates with Mukada though they eventually find common ground. He converts Kirk, who then grows violently devout. When he exiles Kirk, Kirk retaliates by having the Bikers humiliate Cloutier and seal him in the kitchen wall. When a gas blast destroys the kitchen, Cloutier survives and is found with severe burns. He recovers in the hospital and after appearing to several inmates as visions, he disappears. Months later, Hoyt confesses to hiding him back in the wall, where his skeletal remains are found by Mukada.
• Father Daniel Meehan (Malachy McCourt, Seasons 5-6) – A Catholic priest, arrested for assaulting a police officer at a protest that turned violent. He attempts to counsel O'Reily while Cyril is fighting to avoid execution. He dies of a brain aneurysm. Schibetta later claims to O'Reily that he put the 'Evil Eye' on Meehan to cause his death. His death causes O'Reily to regain his faith.

The Gays

The Gays are the most non-violent gang in the prison and they stick together. They do not seem to have a leader but Fiona and Ray Masters are the front figures. Despite usually being in the background, they have had some notable members. Richie Hanlon was a kind individual who was shafted by the Aryans, and Jason Cramer was the only inmate who was ever released and stayed out. Nat Ginzburg was known for killing the former Sicilian leader Antonio Nappa. Alonso Torquemada who entered late in the series, seemed the perfect leader with tons of ambition, but by then the show was declared to be over.

• Billie Keane (Derrick Simmons, Season 1) – Jefferson Keene's brother. He is beaten and hospitalised by Ortolani but recovers. Despite his homosexual status being at odds with Jefferson's newfound Islamic ideals, they make peace shortly before Jefferson's execution.
• Richie Hanlon (Jordan Lage, Seasons 2-3) – A good-natured inmate. He overhears Alvarez talking about Glynn's daughter's rape and alerts Mukada. He is later raped by Mack and accidentally kills inmate Freakie who subsequently approaches him for sex. He tries to give up Mack for Vogel's murder but is blackmailed into taking the blame himself and is sent to Death Row. He and Bellinger bond, with her attempting to make him a sweater. He manages to beat the murder charge and is sent back to Em City. He is immediately killed by Stanislofsky, a friend of Vogel, who mistakenly believed Hanlon was responsible for his death.
• Tony Masters (Steve Wishnoff, Seasons 2-6) – A background character, he is often seen with fellow Gays, Fiona Zonioni and Downing. However, by the sixth and final season, he is shown to be Torquemada's henchman.
• Fiona Zonioni (James Palacio, Seasons 2-6) – A background character, often seen with Tony Masters, but however did interact with Busmalis, as he asks Zonioni to read a letter from Norma Clark, his fiancé, in a feminine voice and reacts pleasantly to it.
• Kiki Faye Downing aka Downings (Rohan Quine, Seasons 1, 3-4) – Usually a background character, though he speaks in Season 4 Episode 2 "Obituaries", to voice his indignation when Jason Cramer tells his fellow Gays in the dining hall about the jury's homophobic prejudice during Cramer's trial (but Downing is glad when Cramer adds that this prejudice may get Cramer's sentence overturned).
• Jason Cramer (Robert T. Bogue, Seasons 3-4) – The Gay inmates' representative in the boxing tournament. He makes it to the semi-final, where he is narrowly beaten by Khan. After discussing the homophobic bias in his murder trial with Saïd, they are able to get him a retrial. Despite his guilt, his conviction is overturned when it is revealed the Detective planted false evidence and he is released, making him one of the few inmates to leave Oz for good.
• Nathaniel 'Nat' Ginzburg (Charles Busch, Seasons 3-4) – Nappa's cellmate in the ward for HIV-positive inmates. He helps Nappa with his memoirs and cooks him dinner, but then smothers him on orders from Pancamo. He is sent to Death Row where he befriends Bellinger and Deyell. As his health declines from AIDS, he requests his execution be brought forward but he succumbs to the disease the night before his rescheduled execution.
• Alonzo Torquemada (Bobby Cannavale, Season 6) – A nightclub owner, sent to Oz for throwing acid at another man. He comes into Oz selling D-tabs, a type of designer drug. He ingratiates himself with both the Italians and the Latinos, and gets them both addicted to his pills. He is attracted to Alvarez and continually tries to seduce him, succeeding when a depressed Alvarez is denied parole.

The Gangstas

The Gangstas or the Homeboys are a black gang in Oz and have the most members compared to other gangs. They also however suffer the most losses, although many of them are due to internal struggles. They are the least religious group and the most drug affected.

• Jefferson Keane (Leon Robinson, Season 1, 6) – The original leader of the Homeboys, serving life without parole for killing a couple on their wedding day. He loathes the Wiseguys, especially after Ortolani beats his brother Billie. Despite the escalating war between the Homeboys and the Sicilians, he grows disillusioned with his gangster life and converts to Islam, taking the name Tizi Ouzou. Worried that Keene will reveal his involvement in several murders, O'Reily arranges for Keene to be sent to Death Row after he is manipulated into killing another inmate in a gladiator-style arena. Before he dies, he donates a kidney to his sister. At peace with his life, he apologises for his crimes, reconciles with his family and is executed.
• Johnny Post (Tim McAdams, Season 1) – A drug dealer, serving life. He is tasked by Keene with killing Ortolani. He pays a CO to let him into the cell in which a sedated Ortolani lies and immolates him. O'Reily later gives up Post to Schibetta and he is beaten and mutilated by the Sicilians. His severed penis is later sent to Keane’s cell in a box.
• Paul Markstrom (O.L. Duke, Season 1) – Originally claimed to be Glynn's cousin, he is actually an undercover police officer, sent into Oz to shut down the drug trade. He befriends Keane, Abebisi and Wangler. However, his duplicity is discovered and he is hanged in the gym.
• Jackson Vahue (Rick Fox, Seasons 1-2, 4, 6) – A famous NBA basketball player, arrested for assaulting a woman. He initially struggles adapting to Oz due to his lack of status though he redeems himself after trying to help an injured prisoner during the riot. When McManus arranges a basketball tournament between himself and Vahue, he is partnered with Busmalis. Vahue and Busmalis win two of three matches, despite the meddling of both inmates and officers. Vahue is eventually paroled. After returning to Oz for a publicity shoot, he brushes off Officer Brass who later makes a failed attempt on Vahue's life.
• Junior Pierce (Lexington Alexander, Seasons 2-4) – A friend of Wangler and Poet. He arranges one of his contacts to murder Wangler's wife and lover and is later severely injured when Adebisi pours boiling soup on his face. He is killed by Tarrant.
• Malcolm "Snake" Coyle (Anthony 'Treach' Criss, Season 3) – A friend of Wangler's sent to Em City for armed robbery. In an attempt to impress and earn Hill's respect, Snake boasts to Hill that he murdered a family, including a baby. Hill later uses this information to bring a conviction against him but before he can be tried, Nappa organises his murder.
• Kevin "Supreme Allah" Ketchem (Lord Jamar, Season 4) – Ran in the same gang as Redding and Hill, though he gave up Hill to the cops, leading to them both despising him. He aligns himself with Adebisi and takes significant control while Querns controls Em City. He is framed for the murders of Shemin and Browne though he escapes conviction. He tries to start an uprising against Redding with the help of Hill and Daniels, but Hill and Poet use his fatal allergy of eggs to kill him.
• Raymond "Mondo" Browne (Gano Grills, Season 4) – One of the inmates transferred to Em City during Querns' tenure. He rooms with Beecher and they sleep together. He is seduced and killed by Keller and his murder is pinned on Supreme Allah.
• Carlton "Tug" Daniels (Method Man, Season 4) – The brother of the man Supreme Allah was incarcerated for killing. Poet tries to have him kill Supreme Allah, though he survives and Daniels is sent to Oz. He and Supreme Allah then team up to take control of the Homeboys from Redding. His treachery is uncovered and he is killed by the Homeboys after a mock trial.
• Leroy Tidd (Jacques C. Smith, Season 4) – A friend of Adebisi's during the black takeover of Em City. He offers to kill Saïd for the Aryans due to Saïd killing Adebisi. He feigns conversion to Islam, taking the name Salah Udeen, but finds he cannot kill Saïd and his conversion becomes genuine. The Aryans then have Jenkins try to kill Saïd, though Tidd protects Saïd and is killed in his place.
• Moses Deyell (Erik King, Season 4) – A Death Row inmate, awaiting execution for murdering his lover and her husband. He befriends Bellinger and Ginsberg. After Bellinger's execution and Ginsberg's death, he is left with only the racist Miles for company. After tiring of Miles' taunts, he digs a hole through their adjoining wall and strangles him to death. He later tries to befriend Giles but is irritated by the latter's nonsensical speech patterns. He requests his organs be donated after his execution and meets the intended recipients. During a transfer to the hospital for a checkup, he attempts escape and is shot to death.
• Burr Redding (Anthony Chisholm, Seasons 4-6) – The leader of Hill and Supreme Allah's gang. He acts as a father figure for Hill but despises Supreme Allah. He takes control of the Homeboys from Poet after Adebisi's death and refuses to align with the Latinos and the Sicilians. He tries to start a rumble with the Latinos and the Sicilians, but Hill tips off the officers, leading to their estrangement. He welcomes Hill back after Hill arranges Supreme Allah's death. He is devastated by Hill's death and neglects his leadership duties. He eventually regains control and tries to pull the Homeboys from the drug trade by having them work as telemarketers, with mixed results.
• Reggie Rawls (Mtume Gant, Seasons 5-6) – A background member of the Homeboys. He proves to be very effective while working as a telemarketer.

The Irish

The Irish are perhaps the smallest gang in Oz based on membership, mostly driven by the schemes of Ryan O'Reily. As a gang they might appear to be insignificant, but Ryan O'Reily manages to factor into most major plots throughout the series.

• Timmy Kirk (Sean Dugan, Seasons 2-6) – A background character in seasons 2 and 3, he is mainly seen assisting O'Reily or antagonising Wangler in the GED program. Originally a Catholic inmate, he is converted to Protestantism by Cloutier and becomes aggressively devout. He attempts to forcibly convert other inmates and is exiled by Cloutier. He also becomes an enemy of Mukada after Mukada refuses to welcome him back into a Catholic church. He is sent to Death Row for organising the arson of a church that killed two priests, where he then converts to Satanism. Despite surviving several attempts on his life, Hoyt finally manages to electrocute him with a photography lamp.
• Liam Meaney (Seth William Meier, Seasons 3-6) – Often seen as O'Reily's lieutenant, he helps O'Reily with schemes throughout the prison. He is recommended for parole towards the end of the series but is unsuccessful and dulls the disappointment by getting high on Bukowski's pot brownies.
• Patrick Keenan (Dylan Chalfy, Season 4) – Convicted for the rape of Dr. Nathan. Though originally thought that O'Reily put him up to it, he attacked Nathan randomly. O'Reily makes 'an exception' to never killing people himself and kills Keenan with a dumbbell. Though Arif witnesses this and tells Glynn, O'Reily manages to pin the murder on Stanton and the multiple suspects means no one is punished for his murder.
• Padraic Connolly (Brían F. O'Byrne, Season 4) – An IRA member, briefly held in Oz awaiting deportation to Britain. With O'Reily's help, he attempts to build a bomb but it fails to detonate. Ironically, Oz is heavily damaged by a gas explosion in the kitchen soon after.
• Seamus O'Reily (Kevin Conway, Seasons 3-6) – Ryan and Cyril O'Reily's abusive father. First seen when O'Reily organises a visit, knowing that he will get Cyril angry enough to defeat Khan in the boxing match final. He is later sent to Oz for murder and O'Reily eventually makes peace with him, taking care of him after he is injured by Neema. Seamus died 2 weeks before Ryan was pardoned release from the governor.

The Sicilians

The Sicilians, also known as the "Wiseguys", are one of the most powerful gangs. In the beginning of the series, they run the drug trade with an iron fist, but because of Ryan O'Reily and Simon Adebisi, they lost their leader Nino Schibetta and control of the drug trade. Schibetta's son, Peter, failed to take it back, but under Antonio Nappa they finally got back a lot of their power. Adebisi caused trouble again for them however by stabbing Nappa with an AIDS-infected needle and thus infecting Nappa with HIV. When the prospect of a slow death caused Nappa to need to confess his crimes through his autobiography, he was ordered killed by the next leader, Chucky Pancamo. Pancamo then led the Wiseguys for the rest of the series, only with brief interlude when he was stabbed by Robson and almost died from a staph infection.

• Nino Schibetta (Tony Musante, Season 1) – The original leader of the Sicilians in Oz. He runs the drug trade in the prison. He gets into business with the Homeboys. O'Reily and Adebisi slowly kill him by putting ground glass in his food.
• Dino Ortolani (Jon Seda, Season 1) – A volatile inmate and Nino Schibetta's Lieutenant. He is incarcerated for attempting to kill O'Reily (and successfully killing his friend) and the two immediately clash on O'Reily’s arrival to Oz. Despite his brutality, he shows interest in Saïd's peaceful way of life, rejects praise from the Aryans for beating up a gay, black man and euthanises a dying Latino patient at his request. This final act results in him being sent to the hole and sedated. He is then burned and murdered by Post, on orders from O'Reily and Keane. In a final twist, O'Reily then moves into Em City and takes Ortolani's old pod.
• Joey D'Angelo (Goodfella Mike G, Season 1) – He assists Schibetta in running the kitchen, until he is hospitalised following an assault from the Homeboys.
• Peter Schibetta (Eddie Malavarca, Seasons 1-3, 5-6) – Sent to Oz for money laundering and extortion. He attempts to fill father's shoes and though he has the loyalty of the Sicilians, he makes numerous mistakes. He is raped by Adebisi and the trauma causes a mental breakdown, leading to him spending 4-years in the psych ward. When he returns, he continues his campaign for respect, but is raped by Schillinger and the Aryans and suffers another mental breakdown and is sent back to the psych ward. Almost 1-year later, Schibetta returns and is transferred to General Population. Schibetta later claims to have killed Father Meehan via a Sicilian curse called “The Evil Eye”. He then threatens Suzanne, O’Reily’s mother, with the curse. O'Reily manipulates Pancamo and the Sicilians into killing Schibetta.
• Chucky Pancamo (Chuck Zito, Seasons 2-6) – Originally Peter Schibetta's and then Nappa's backup, he takes leadership of the Sicilians after they are both removed from Em City. Despite his admiration, he arranges the death of Nappa when it is revealed Nappa is writing his memoirs and could reveal mafia secrets. He represents the Sicilians in the boxing tournament, though he is drugged and beaten by Cyril O’Reily. He is shown to be willing to help anyone for a price, including arranging the death of Hank Schillinger. Pancamo is then stabbed during a brawl with the Aryans and nearly dies from a staph infection. He recovers, rejoins the Sicilians and is manipulated by O'Reily into killing Schibbetta.
• Antonio Nappa (Mark Margolis, Seasons 2-3, 6) – Takes control of the Sicilians after Schibetta's rape and breakdown. He wields considerable power within the prison, being able to arrange for Adebisi to be caught with drugs in his system and arranging Coyle's murder. Adebisi secretly infects him with HIV and he is transferred to Unit E, the AIDS ward. Faced with the end of his life, he decides to write his memoirs. Pancamo is afraid he could reveal mafia secrets and arranges for Nappa's cellmate Ginzberg to smother him in his sleep.
• Frank "The Fixer" Urbano (Antoni Corone, Seasons 5-6) – An occasional leader of the Sicilians. He attempts to kill Redding though kills Hill instead. He later assists Pancamo in killing Schibetta.

The Latinos

The Latinos, also known as "El Norte", are one of the three main players in the drug trade along with the Italians and Homeboys. They tend to have an easier relationship with the Italians rather than the Homeboys, although they have cooperated with both. Besides drugs, they also deal in alcohol and medical supplies via their members doing work detail as orderlies. Miguel Alvarez led the gang in the beginning, then El Cid Hernandez took over and forced Alvarez into proving himself by sticking out the eyes of a CO. This landed Alvarez in solitary where he went in and out through the series. Chico Guerra was the perpetual lieutenant, both to Hernandez and Morales. Guerra had a long rivalry and vendetta to Alvarez, but made peace in the end. After Morales died, nobody stepped up to lead.

• Emilio Sanchez (Jose Soto, Season 1) – Sanchez was an AIDs infected patient, who homophobic Italian member, Dino Ortolani, knew while working the AIDs ward as a punishment for his homophobic-related assaults, the two bond while talking about their children despite Ortolani constantly criticising Sanchez's homosexual status. He asks Ortolani to help him die, a request Ortolani eventually grants and he is suffocated.
• Ricardo Alvarez (Tomas Milian, Season 1) – Eduardo's father and Miguel's grandfather. He was sent to Oz when Eduardo was a baby and did not see his son again until he was sent to Oz as well. He killed a Haitian inmate who cut out Eduardo's tongue and was sent to solitary and was eventually able to meet his grandson. He develops Alzheimers and dies offscreen.
• Eduardo Alvarez (José Ramón Rosario, Seasons 1-2) – Ricardo's son and Miguel's father who has been in Oz most of Miguel's life. Soon after being sent to Oz, he had his tongue cut out by a Haitian inmate for being abusive. He works as an orderly in the prison hospital with his son and together, they care for a dying Ricardo. Alvares comes to him when Hernandez orders him to blind Rivera and Eduardo shows frustration that he is unable to advise his son.
• Jorge Vasquez (Jose Hernandez Jr., Seasons 1-4) – A background member of the Latinos, identifiable by his long, dark hair. He is present for the riot and is often seen with the other Latinos, though he has no storylines. While Alvarez is briefly released from solitary, Vasquez attacks him but Alvarez slits his throat with a razorblade, killing him.
• Carmen "Chico" Guerra (Otto Sanchez, Seasons 2-6) – The ever-present lieutenant of the Latinos. He was arrested for murder after he threw a dwarf off a bridge. He tires of Alvarez's inaction against other inmate groups that disrespect the Latinos. When Hernandez takes control of the Latinos, Guerra grows to hate Alvarez and constantly belittles and tries to kill him, even when Morales forbids it. He eventually gets over his hatred of Alvarez when all the other leading Latinos have been killed and is last shown tearing his own skin after getting high on Torquemada's pills.
• Raoul "El Cid" Hernandez (Luis Guzman, Seasons 2-4) – An infamous Mexican gangster who takes over the Latinos shortly after his arrival. Despite Alvarez's admiration, Hernandez considers him "too white" and consistently verbally abuses him, ultimately forcing him to blind Officer Rivera to prove himself. He leads the Latinos until Morales arrives, continuing to torment Alvarez. However, El Cid ultimately starts to realize how empty his life is and begins to regret his choices. However, in order to gain the respect of the Italians and Homeboys, as well as leadership of the Latinos, Morales arranges for Rebadow to kill Hernandez and claim self-defence.
• Carlo Ricardo (Juan Carlos Hernández, Season 3) – An inmate who is originally visited by many family members, though they drop off after time. He is selected to represent the Latinos in the boxing tournament but is disqualified after he is sent to solitary. He misses his final visit with his sister and is shown to be greatly depressed that he no longer has anyone visiting him. He attempts to kill Alvarez but dies in the process. Alvarez then falsely tells Glynn that Ricardo was responsible for raping Glynn's daughter. He is Bevilacqua's cousin.
• Enrique Morales (David Zayas, Seasons 4-6) – A soft-spoken, cunning inmate who takes control of the Latinos after arranging Hernandez's murder. He forms an alliance with Pancamo and Adebisi to control the drug trade but is forced out by Adebisi. He also arranges for Martinez to maim Officer Brass. Brass later fakes hearing a deathbed confession from Martinez that Morales ordered his attack and Morales is moved to solitary. He is attacked by Officers Brass, Howell and Murphy and injured in a similar way to Brass. While recovering in hospital, he alerts McManus to Nurse Grace before he is murdered by her. The Latinos are shown to be in disarray after his death.
• Louis Bevilaqua (G.A. Aguilar, Seasons 2-4) – First introduced as an inmate in solitary. He was sent to Oz for murder, but it is unknown what got him sent to solitary. Alvarez reveals that Bevilacqua was the one who raped Glynn's daughter, not Ricardo as previously thought. As Ricardo's cousin, he attempts to kill Alvarez during an exercise period for the inmates in solitary but Giles takes his shank and kills him instead. Alvarez does not tell Glynn the real rapist's identity.
• Carlos Martinez (Carlos Leon, Seasons 4-6) – First appears in the prison hospital when he unsuccessfully tries to kill Alvarez. He later slashes Officer Brass's Achilles tendon, ending his basketball career. He is sent to solitary but refuses to confess that Morales ordered the attack. While in solitary, he regularly has sex with Officer Howell. He falls ill and is transferred to the hospital. He assaults Dr Nathan during his checkup and she subsequently neglects his care. When he later dies, Dr Nathan blames herself but it is eventually revealed he was suffocated by Nurse Grace.
• Jamie Velez (Christopher Rivera, Season 5) – An inmate who allies himself with Alvarez when Alvarez is briefly released from solitary. He tries to kill Guerra in the showers and is killed in the attempt.
• Pablo Rosa (Michael Rivera, Season 6) – A young inmate convicted of manslaughter after the gun he brought to school to show off fired and killed a classmate. He struggles with his anger but bonds with Stella when she gives him a book to read. When he is thrown in the hole for attacking an Aryan, Stella reads to him through the wall.

The Muslims

The Muslims are the most devout gang in Oz. They mostly stay away from violence and gang-related things. They are anti-drugs and against almost everything else that falls in that category. Kareem Saïd was their natural leader for almost the entire series, but his position was usurped by Hamid Khan (Ironically just after Saïd refused a pardon to be with his Muslim brothers). After Khan died in the boxing tournament, Arif took over but found he could not lead. Saïd took over leadership duties again but after he killed Adebisi in self-defense and convert Salah Udeen was killed by the Aryans, he had an angry period where he gave into violence a lot. When he came around again he started the book-binding business, and then suddenly, was shot by Lemuel Idzik. Arif took over after that, but again could not handle it. When the series ended it was not certain who was the leader. Huseni Mershah was more gang member-like but his effort to take over from Saïd failed and he was cast out. Saïd converted Jefferson Keane but he was set up by Ryan O'Reily fearing that he would inform on him. The Muslims had almost inevitably long-running tensions with the Aryans.

• Zahir Arif (Granville Adams, Seasons 1-6) – Saïd's lieutenant for the majority of the series. He is serving time for assault and possession of stolen goods. He is loyal, though he sides with Khan when he replaces Saïd as leader of the Muslims. After Khan's death, Arif takes charge of the Muslims but quickly realises he is not a leader and gives Saïd the position again. He is the only person to witness O'Reilly murder Keenan but his information does not lead to a conviction, thanks to O'Reilly's manipulation. He is forced to lead the Muslims again after Saïd's death and tries to run the printing press. However, he once again proves a weak leader and has the printing press burned to claim the insurance money.
• Nacim Busmilla (Ra Hanna, Seasons 1-6) – A Muslim inmate regularly seen as Saïd's chief bodyguard. He is mostly silent and steadfastly loyal to Saïd; he is last to leave the table when Khan ousts Saïd as leader of the Muslims and does so reluctantly. He seems briefly swayed by Supreme Allah but quickly returns to his Islamic beliefs. When it is revealed that Arif purposely had the printing press burned, he beats Arif.
• Sanjay Afsana (Conrad Lindsey) – A background member of the Muslims. He is identifiable by his red kufi decorated with white shells.
• Huseni Mershah aka James Monroe Madison (Roger Guenveur Smith, Season 1) – An inmate who favours a more violent approach to Islam than Saïd practices. His attempts to 'defend' their faith to other inmates only angers Saïd. When Saïd suffers a heart attack, Mershah leaves him to die, hoping to take over the Muslims. Saïd survives and exiles Mershah. When he is unable to find allies among either the Muslims or the Homeboys, he tries to give up Saïd to Glynn, leading to a shakedown in which many of the inmates lose drugs, weapons and privileges. All Em City's inmates turn against him and spit on him as he is transferred out of Em City. Soon after, he commits suicide.
• Hamid Khan (Ernie Hudson Jr., Season 3) – Arrested for assault after severely beating a white man he caught raping a black woman. He disapproves of many of Saïd's actions, from meeting with Tricia Ross (a white woman), appointing a Jewish lawyer to lead the court case, and allowing Beecher to listen to the Muslim's Bible study. He eventually replaces Saïd as leader of the Muslims. He competes in the boxing tournament, easily defeating Wangler, narrowly beating Cramer and finally facing Cyril O'Reilly in the final. Cyril's final punch leaves him brain dead and his wife sues the prison and has him removed from life support.
• Ahmad Lalar (Chris Gardner, Season 5) – A young Muslim inmate. He sneaks a piece of bread during prayer and is nearly exiled by Saïd, but is allowed to remain. He is identified by the Aryans as the weakest member of the Muslims and subsequently murdered by Robson.

The Others

• Donald Groves (Sean Whitesell, Season 1) – A cannibalistic inmate with a childlike demeanor and limited emotional range. He is incarcerated for murdering his parents; he ate his mother and claimed he was saving his father for Thanksgiving. He converts to Catholicism (liking the concept of eating flesh and drinking blood during the Eucharist), is constantly caught sneaking into the morgue, burns 'MOM' onto his hand and fears the dentist. He is impressed with Saïd's rhetoric and attempts to kill Glynn. He instead kills Officer Lawrence Smith and is sentenced to death. He requests death by firing squad. Smith's mother Loretta visits him prior to his execution and he breaks down after receiving her forgiveness, finally showing emotion. He attempts to dictate his final words in a letter to Loretta but no one hears what he says before he is executed, to Mukada's dismay.
• Richard L'Italien (Eric Roberts, Season 1) – A Death Row inmate with a fondness for the Yo-yo. While awaiting execution for the rape and murder of one woman, he subsequently confesses to the murder of over 30 others. He explains to Mukada that he loves every woman he sees. However, he believes that when he loves them, they own him and he refuses to be owned.
• Ronald Poklewaldt (Brian Tarantina, Season 1) – An inmate imprisoned for burning down a fire station. He is an addict and it is seen attending Sister Pete's counselling sessions. He falls afoul of the Homeboys when he is unable to pay and tries to bring them down by informing on them. O'Reilly lets him bust his and Healy's drug smuggling business to gain favour with Nino Schibetta. O'Reilly admits to the officers that Poklewaldt was the informant on Healy, leading to them beating Poklewaldt. He survives and is occasionally seen in the background from then on.
• Eugene Dobbins (Zuill Bailey, Season 1) – A famed cellist, sent to Oz for murdering a rival. Hill is attracted to his talent and arranges another inmate to play with Dobbins while he practices. Vahue smashes the cello and a depressed Dobbins spends his time watching TV. He is stabbed during the riot and despite Vahue leaving Em City to get him help, he dies of his injuries.
• Alexander Vogel (Brian Smyj, Season 2) – A Jewish inmate doing time for murder, and known for his sheer size. Killed by Schillinger and Mack as a 'roadkill', a random killing to show the other inmates that the Aryans are to be feared. Hanlon is forced to confess to the murder though he is not convicted. He is a friend of Stanislofsky.
• William Giles (Austin Pendleton, Seasons 2-5) – An elderly inmate convicted in the 1960s for murder who has been living in solitary since 1995 for killing his cellmate Ron Bibi. He is obsessed with oral hygiene and speaks in riddles and morse code. Sister Pete eventually deciphers a series of words into a confession that he witnessed the murder of her husband Leonerd by Bibi. During a period of exercise for the solitary inmates, Giles kills Bevilacqua and is transferred to Death Row. He requests death by stoning. To avoid an uproar over such a barbaric execution method, Devlin orders Giles declared insane and returned to solitary. Giles jubilation at the commutation of his death sentence is shattered when he realises that his tiny solitary cell is not much better. He is released from solitary when the air proves toxic and he successfully defends himself against Alvarez, to the amusement of the other inmates.
• Jiggy Walker (LL Cool J, Season 2) – An inmate who comes to Em City, claiming to be Governor Devlin's drug dealer. Saïd and McManus quickly publicise this to embarrass Devlin. Devlin easily disproves Walker's claims and McManus angrily transfers Walker out of Em City.
• Kipekemie Jara (Zakes Mokae, Season 2) – A Nigerian witch doctor, sent to Oz for criminally negligent homicide. He takes an interest in Adebisi and tries to get him to turn away from his life of drugs and indulgence. Though he succeeds somewhat, he is killed by Wangler in a show of good faith for Nappa. His death is blamed on Adebisi and causes Adebisi to have a mental breakdown.
• Nikolai Stanislofsky (Philip Casnoff, Seasons 3-4) – A Russian inmate who maintains a prickly alliance with O'Reilly. His Em City sponsor is Busmalis. He murders Hanlon, thinking him responsible for the murder of his friend Vogel, narrowly survives an assassination attempt by Kosygin and acquires Galino's cellphone. He eventually loses the cellphone to O'Reilly and moves to protective custody. Querns warns O'Reilly not to let anything happen to Stanislofsky after he returns to Em City. O'Reilly instead has Stanislofsky killed before he returns to Em City, by having Officer Howell electrocute him in a bathtub.
• Yuri Kosygin (Olek Krupa) – A Russian inmate who arrives in Oz with a reputation as a killer for hire. O'Reilly pays him to kill Cudney and later Pancamo has him try to kill Stanislofsky. Stanislofsky survives and Kosygin is put in the hole, later solitary confinement. A deleted scene sees him murdered by a member of the Russian Secret Police.
• Guillaume Tarrant (Lothaire Bluteau, Season 4) – An inmate sent to Oz for destroying a statue in a museum. A diminutive man, he is sponsored by Hoyt, who promptly mugs him. He is also frequently picked on by Wangler, Pierce and Poet. After O'Reilly advises him to stand up for himself, he finds Adebisi's gun in his bed. The next time he is confronted by Wangler and his gang, Tarrant fires the gun, killing Wangler, Pierce, Lou Rath and Officer Joseph Howard, as well as wounding several others. He then turns the gun on himself.
• Ralph Galino (Domenick Lombardozzi, Season 4) – An Italian inmate sent to Oz after a building he designed collapsed and killed two people. With no mafia connections, the other Italian inmates abandon him. He manages to bring a cellphone into the prison, unaware it is against the rules. Stanislofsky offers to turn it in but keeps it for himself. After Galino is made aware of this, Stanislofsky organises his death by having the Bikers inject him with a lethal dose of heroin. Though his death is ruled as suicide, Hoyt eventually confesses to his murder.
• Johnny Basil, aka Desmond Mobay (Lance Reddick, Season 4) – An undercover cop sent to Em City to shut down the drug trade. He eventually becomes accepted as a drug runner, though he becomes addicted to heroin and murders Goergen to get there. Hill identifies him as a cop and shames him into confessing to Goergen's murder. Basil is sent to Oz to serve his sentence and lives in Unit J (the Cop Unit) with Hughes and Yood. After insulting Hughes, Hughes murders him by stabbing him in the chest.
• Bruno Goergen (Harry O'Reilly, Season 4) – A corrupt former cop, sent to Oz for murder. He recognises Basil and threatens to expose him if he does not protect Goergen from the other black inmates. Since Basil has been ordered to murder someone to prove his worth to the drug runners, he kills two birds with one stone by pushing Goergen down an elevator shaft.
• Eli Zabitz (David Johansen, Season 4) – A Jewish inmate. Schillinger pays him to implicate Keller in the kidnapping of Beecher's children. He gives Beecher the false information in exchange for dental work for one of his own daughters. Keller pledges to kill him and after demanding protection from the Aryans, Shillinger also orders Robson to kill him. Robson and Keller corner Zabitz in a storage room and the stress causes him to have a fatal heart attack, to their amusement.
• Nate Shemin (Season 4) – An inmate with whom Beecher becomes intimate. Later killed by Keller in an attempt to discredit Querns and get back at Beecher. His murder is pinned on Supreme Allah, though Beecher knows the truth.
• Ronald 'Ronnie' Barlog (Brian Bloom, Season 4) – A friend of Keller's who is sent to Em City for car theft. He rooms with Beecher and Beecher seduces him. Keller also seduces him to get back at Beecher. Barlog is approached by Agent Taylor, who offers him a sentence cut in exchange for information about Keller murdering several gay men. After he seeks legal advice from Beecher, Beecher warns Keller and Keller snaps Barlog's neck.
• Alvin Yood (Tom Ligon, Seasons 4-6) – A resident in Unit J, though he was actually a small town sheriff rather than a cop. He befriends Basil and is antagonised by Hughes. He also pushes Howell down the stairs and takes Beecher's job as Sister Pete's assistant. He witnesses Bandt's murder but refuses to talk.
• Glen Shupe (Joel West, Seasons 2-6) – A drug addict, arrested for killing his playing partner during a darts game. He is recognisable for his long hair and tie-dyed shirts. Kenmin pays him to tell O'Reilly that Li Chen plans to rape his mother, though this is a ploy to provoke the brothers. O'Reilly then has the Latinos injure Shupe in an accident where he loses his right arm. He later tries to admit the truth about Kenmin and Cyril but he is deemed an unreliable witness and his testimony useless.
• Colonel Edward Galson (John Doman, Season 4) – A military Colonel, imprisoned for raping a female colleague. He is an alcoholic and is seen attending Sister Pete's counselling sessions. He rooms with Redding and the two bond over their military history in the Vietnam War. He overhears Daniels and Supreme Allah plotting to kill Redding and warns his cellmate. Redding tasks Galson with killing Morales, however Morales gets the upper hand and crushes him beneath an elevator.
• Greg Penders (John Lurie, Seasons 4-6) – An inmate serving time for criminally negligent homicide, though it is unknown why he was sent to solitary. He initially helps Hughes in his attempt to declare solitary as the Republic of Huru, though he then protects Glynn and kills Hughes. He is transferred to Em City when solitary is evacuated and participates in the guide dog program. He teaches his dog to attack Officer Lopresti and is returned to solitary. He gets sick from the toxic air in solitary and attempts to sue the state.
• Jia Kenmin (M.G. Gong) – A Chinese inmate, convicted for drug trafficking. He originally attempts to kill Morales in revenge for the death of Bian Yixhue and is involved in Redding's unsuccessful war with the Latinos. He later becomes an enemy of O'Reilly. He goads Cyril into killing Li Chen, resulting in Cyril being sent to Death Row and eventually executed. O'Reilly then provokes Kenmin into a fight and assists the officers in violently subduing him. Since he attacked officers, Kenmin is thrown into solitary without medical attention and the officers later beat him to death.
• Adam Guenzel (Mike Doyle, Season 5) – A family friend of Beecher's, sent to Em City along with his a friend Franklin Winthrop for raping a college girl. Beecher keeps him safe from the Aryans, but their friendship ends when the homophobic Guenzel finds out about Beecher's relationship with Keller. Schillinger offers Beecher an opportunity to see Keller in exchange for allowing the Aryans to rape Guenzel. Beecher agrees after Guenzel attacks him. Guenzel is transferred to Unit B and gang-raped by the Aryans. When Schillinger thinks Guenzel will tell the officers what has happened to him, he tricks Guenzel into trying to escape, and Guenzel is killed when he is electrocuted on the prison fencing.
• Henry Stanton (Thomas G. Waites, Seasons 4-6) – An inmate who befriends Cyril while they are both in protective custody. O'Reilly disapproves of this and tries to keep them apart. O'Reilly makes it appear Stanton is in love with Dr Nathan, frames him for Keenan's murder and has Montgomery corroborate this. Stanton attempts to kill Montgomery and is sent to solitary.
• Martin Montgomery (Peter Criss, Season 5) – An inmate O'Reilly pays to say Stanton killed Keenan. O'Reilly then tells Stanton that Montgomery accused him, and Stanton stabs him in the neck. He survives but it not seen again.
• Clarence Seroy (Emanuel Yarbrough, Seasons 5-6) – A morbidly obese inmate with a fondness for arson and rape. He is hired by Kirk to organise the arson of a church Mukada is visiting, resulting in the death of two priests. He tries to rape Winthrop and later rapes Robson. Robson allows this, as he knows he is HIV positive.
• Li Chen (Nelson Lee, Season 5) – A Chinese inmate used by Kenmin in his war with the O'Reilly brothers. He attempts to kill the O'Reilly brothers on Kenmin's orders and manages to stab Ryan. Cyril stabs him in the heart and is sentenced to Death.
• Wolfgang Cutler (Brendan Kelly, Seasons 5-6) – An inmate doing time for murder. He tries to join the Brotherhood by killing Saïd but fails and is most commonly associated with the Bikers. Robson goes to him when he needs protection from his many enemies after being cast out of the Brotherhood, only to make him his so-called "Bitch". Cutler is briefly given the part of Macbeth in the prison play and considers Macbeth a 'pussy' for being unable to deal with murdering his king. Robson tricks Cutler into hanging himself during autoerotic asphyxiation, with his death being ruled suicide. For reasons unknown, his will leaves all of his possessions to Alvarez though Alvarez gives everything to Cutler's widow Cathy Jo.
• Lemuel Idzik (Joel Grey, Season 6) – Posing as a publisher for the release of Hill's memoirs, Idzik ambushes Saïd in the visiting room and shoots him. He is then sent to Oz. His Jewish faith alienates even the Aryans, who wanted to embrace him for killing their long-time enemy. He explains to White that many years ago, Saïd (while still known as Goodson Truman) spoke to him about how the universe would eventually end. Idzik was significantly affected by this information. He quit his job, abandoned his family and vowed to kill Saïd for ruining his life. He then asks White to kill him. White refuses, so Idzik kills White and is transferred to Death Row. His sentence is later commuted to life imprisonment, to his despair.
• Jahfree Neema (Peter Francis James, Season 6) – An inmate arrested for kidnapping; his victim was his daughter of whom he did not have custody. He is a former Black Panther and lover of Suzanne Fitzgerald. O'Reilly initially hates him and tries to arrange his murder, though he gains respect when he organises a protest over Cyril's execution. The Homeboys unsuccessfully try to have him lead them as Redding is still distracted by Hill's death. Seamus O'Reilly attempts to kill Neema but Neema turns the knife on him and is subsequently sent to the hole.
• Mayor Wilson Loewen (Tom Atkins, Season 6) – Arrested after it is revealed he was involved in the death of two African American girls in the 1960s. Though he seems a friend of Devlin and Schillinger, he antagonises them both and they both turn their backs on him. Beecher saves him from choking, a factor that counts towards Beecher's successful parole bid. After Loewen threatens to expose Devlin's various crimes, Devlin arranges his murder. Willy Bandt slits his throat while he sleeps. Glynn later investigates the murder, and is killed when he gets too close to the truth.
• Lionel Kelsch (Tony Hoty, Season 6) – An inmate first seen in the prison hospital. He distracts the guards while Brandt murders Loewen. Kelsch then murders Brandt and Warden Glynn and is thrown in the hole when Stanton tells the officers. He quickly admits Officer Johnson orders the hits when threatened with starvation.
• Willy Bandt (Season 6) – An inmate first seen in the hospital. He takes advantage of Kelsch's distraction and murders Mayor Loewen. He admits Officer Johnson's involvement to Glynn and is quickly murdered by Kelsch.
• Stanley Bukowski (Ashley Hamilton, Season 6) – A drug dealer. On arrival to Oz, his pot brownies become popular among the other inmates, which angers the existing drug dealing Italians. Pancamo uses the steam pipes in the kitchen to kill him and make it appear an accident.

Prison staff

The corrections officers (COs) are mostly white, with many black and some Latino officers. They range from kind and well-meaning to cruel and violent. Diane Wittlesy was the CO supervisor in Emerald City initially, then succeeded by Karl Metzger, Sean Murphy, Travis Smith and then Murphy again. Claire Howell excels in cruelty and sexual harassment, despite being a guard. Other staff members try their best to run the Penitentiary but sometimes get involved with the Inmates, such as main medic Dr. Nathan's relationship with O'Reily, and McManus always getting into complicating and overwhelming situations with several of the Inmates in his unit of Emerald City.

• Warden Leo Glynn (Ernie Hudson, Seasons 1-6) – A conflicted person trying to maintain law and order in an often chaotic environment. He does what he can to manage every conflict present in Oz. Sister Pete calls him "the best man for the worst job." Appears in episodes 1–55.
• Tim McManus (Terry Kinney, Seasons 1-6) – A hopeful idealist who forms Emerald City for purposes of making a perfect prison where rehabilitation and conflict are resolved. Often seen as weak for supposedly soft approaches to dealing with the inmates, he still manages to come out on top of many situations. Appears in episodes 1–26 and 28–56.
• Sister Peter Marie Reimondo (Rita Moreno, Seasons 1-6) – A psychologist and nun, she is one of the main forces of good inside of the prison and often is helpful to McManus, Father Ray Mukada and Dr. Gloria Nathan in whatever conflict they are trying to solve. Gave serious thought to leaving the church after developing feelings for Chris Keller. Appears in episodes 1-56.
• Diane Whittlesey (Edie Falco, Seasons 1-3) – A CO who is faced with managing several issues at home, a relationship with McManus, and being fair to the inmates. While on a holiday in London, she becomes engaged to a Buckingham Palace guard and does not return to Oz. Appears in episodes 1–18, 20–24.
• Mike Healy (Steve Ryan, Season 1) – A disgruntled and corrupt officer, Healy has a very low opinion of both the inmates and Unit Manager Tim McManus. Healy is friends with inmate Ryan O'Reily and is a friend of Ryan's brother. Healy and O'Reily run a drug operation in Oz though O'Reily eventually sells him out in order to ingratiate himself with Nino Schibbetta. Healy is arrested and immediately fired.
• Joseph Mineo (Phillip Scozzarella, Seasons 1-6) – An elderly Italian American CO. He is one of the few COs who is seen in every season. He is taken hostage in the Em City riot where he is savagely beaten by Miguel Alvarez and is then traded along with officer Armstrong in exchange for Tim McManus. He is often seen around Em City breaking up fights and counting inmates.
• Jason Armstrong (Timothy L. Brown, Seasons 1-6) – A tall muscular CO who is mainly seen breaking up fights and patrolling. For the most part he is a good honest CO. He is one of the hostages in the Em City riot where he is seriously injured and is traded along with Joseph Mineo in return for Tim McManus
• Eddie Hunt (Murphy Guyer, Season 1) – A CO who appeared in the first season of Oz. He was one of the officers on the firing squad who executed Donald Groves. He was a hostage during the Em City riot where he was killed by the SORT team.
• Vic D'Agnasti (Douglas Crosby, Seasons 1-6) – A muscular CO and back-up SORT team member. He appears in all six seasons and is one of the hostages in the Em City riot. He tries to pass the time by telling terrible jokes, to the annoyance of the other hostages. Crosby was also one of the stunt coordinators for the show.
• Roger Brese (Ray Iannicelli) – An elderly officer regularly seen working the reception desk. He is very lax at his job, allowing many people to smuggle in contraband. After Idzik smuggles in a gun and kills Saïd, Glynn discovers Brese has been drunk on the job and is fired.
• Father Ray Mukada (BD Wong, Seasons 1-6) – A Catholic priest and the main religious authority in Oz. Despite a promising start to his religious career, he was sent to Oz as punishment for clashing with the extremely conservative Cardinal Francis Abgott (Gavin MacLeod), under whom he was serving. Although it was forced upon him, he appears to grow into the role of a spiritual guide over time and firmly believes that his work is important. He provides spiritual counsel to many of the inmates, especially Miguel Alvarez. He later becomes an enemy of Kirk. After Kirk repeatedly attempts to ruin his life and career, Mukada's faith in people is severely shaken and he begins to pray for Kirk's death. Appears in episodes 2–46, 49–56.
• Dr. Gloria Nathan (Lauren Velez, Seasons 1-6) – A prison doctor who leads the prison hospital in providing care for the inmates within Oz. She regularly deals with conflict, both from inmates and from the state medical board. She assists O'Reily when he is diagnosed with breast cancer, leading to O'Reily falling in love with her and arranging the murder of her husband. Their interactions are decidedly hostile, though she comes to accept his love when he murders her rapist, Keenan. She eventually begins to return his feelings though they are rarely able to act upon them.
• Lenny Burrano (Skipp Sudduth, Season 1) – A detective within Oz with ties to the Italian mafia. He is originally tasked with finding out who killed Ortolani and manipulates O'Reily into giving up Post, making him one of the few people able to manipulate O'Reily. He is also seen relaying information to Peter Schibetta from 'the family' and assisting Nappa in bringing down Adebisi. Having previously worked in a prison with a firing squad, he advises the officers on how to conduct Groves execution.
• Lawrence Smith (Curtis McClarin, Season 1) – An African American officer. He defends Glynn when Groves attacks him, and he is accidentally stabbed to death. His death angers other officers to the point that they beat the inmates for minor infractions. His mother visits Oz to clean out his locker and meet Groves.
• Rick Heim (Paul Schulze, Seasons 2) – A SORT team member, he is involved in putting an end to the riot. He gives his gun to Whittlesey and she uses it to kill Ross. Afterwards, he is seen being questioned about these events by both Case and McManus, though he does not reveal the truth.
• Karl Metzger (Bill Fagerbakke, Seasons 2-3) – A white supremacist guard who takes over Whittlesey's position in Emerald City after she is transferred to Unit B. He is secretly a member of the Aryan Brotherhood, and clearly favors the Aryan inmates. He lets Mark Mack and another Aryan switch to Busmalis and Rebadow's cell so they could escape using Busmalis' tunnel and lets Schillinger use the gym to crucify Sippel and cripple Beecher. McManus finds out about his connections with the Aryans, but Beecher covertly murders Metzger before he can do anything about it.
• Eugene Rivera (Nelson Vasquez, Seasons 2-3, 5) – An officer who was previously a member of a rival gang to El Cid's. He comes to Oz and works in Em City. Hernandez orders Alvarez to blind Rivera, which Alvarez does. Afterwards, Rivera participates in the Sister Pete's victim-offender program with Alvarez. He does not forgive Alvarez and the sessions end prematurely. When Alvarez trains a guide dog, he trains her in English and Spanish and gives the dog to Rivera, somewhat burying the hatchet between them.
• Sean Murphy (Robert Clohessy, Seasons 3-6) – An Irish-American CO, Murphy is the staff member most trusted by McManus. A fair and confident officer, Murphy maintains order to the best of his ability in Oz while doing what he can to support McManus' ideology. He is more honest and competent than the other guards and Warden Glynn also holds him in high regard. Appears in episodes 18–56.
• Len Lopresti (Carl DiMaggio, Seasons 3-6) – An officer working on Death Row, who is often seen siding with the Aryans. He brings Andrew Schillinger heroin on behalf of his father during his stay in the hole. During Bellinger's second stay on Death Row, he starts coming to her cell at night for sex. He spends some time in Em City, where he comes into conflict with Penders during the guide dog program.
• Clayton Hughes (Seth Gilliam, Seasons 3-4) – A young and conflicted African American officer, Hughes is very close to Glynn. Hughes' father was Glynn's best friend and was killed while working as a CO when Hughes was seven years old. After being convinced by Adebisi that his father's murder was racially motivated, Hughes becomes a Black Nationalist and attempts to murder the governor. Hughes is sent to Unit-J in Oz which is meant for ex-cops and ex-correctional officers, only to be transferred to Solitary after murdering Johnny Basil. The isolation causes Hughes to suffer a psychotic break, and he manages to escape his cell and take the entire cell block hostage. When Glynn attempts to negotiate with him, Hughes tries to murder him, only to be stabbed to death by Penders.
• Claire Howell (Kristin Rohde, Seasons 3-6) – A female CO, she is extremely unstable and prone to sadistic sexual violence. She begins a relationship with McManus but he breaks it off when she proves violent and possessive. She then accuses him of sexual harassment when he has her fired for misconduct and she is reinstated. She spend most of her time working in solitary, though she has a brief stint in Em City. She has sexual relationships with inmates, including Ryan O'Reily and Carlos Martinez, and murders Stanislofsky on O'Reily's request. She eventually begins to change after learning that she is pregnant, and is unsure who is the father. Appears in episodes 17–39, 41–56.
• Joseph Howard (Season 4) – An elderly African American correctional officer. He appears briefly in Season four where he is killed by inmate Tarrant in a shootout.
• Martin Querns (Reg E. Cathey, Seasons 4, 6) – A jaded and results-oriented black man, Querns is hired by Glynn after pressure by community leaders and the black prison population, led by Adebisi, to hire a black Unit Manager to replace McManus. Querns, as told through a conversation to Adebisi, is only different from the black inmates in that he has been smart enough to have never been arrested for dealing drugs. The complete opposite of McManus, he believes that drugs are good for the prisoners because they subdue them until they are incapable of any discipline problems. He runs Emerald City by making Adebisi and his partners in Oz's drug trade the main trustees, allowing them to do all the drugs that they wish as long as no violence occurs in Emerald City. Kareem Saïd and McManus completely oppose this which leads to his firing. His efficiency, however, gets him promoted to the position of warden at another state correctional facility and he transfers back to Oz following the death of Leo Glynn.
• Adrian Johnson (Cyrus Farmer, Seasons 4, 6) – An African American officer who works in Em City during Querns' tenure. He is acquainted with Perry Loftus, Devlin's assistant, who asks him to organize the murders of Loewen, Bandt and Glynn. Once his involvement is revealed, he gives up Loftus and is allowed to go free.
• Floria Mills (Dena Atlantic, Season 4) – A woman hired as Glynn's secretary. She proves invaluable at her job and almost everyone, inmates and staff, is attracted to her beauty.
• Dave Brass (Blake Robbins, Seasons 4-6) – An officer with a talent for basketball. McManus recruits him as his teammate in a series of games against Vahue. He manages to win the second match after Vahue is injured. McManus organises for Brass to train with the NBA, however Morales has Martinez maim Brass by severing his Achilles tendon. Thereafter, Brass walks with a limp. He steals a winning lottery ticket from Rebadow, who intended to use the money for his ailing grandson. By the time he returns, Rebadow's grandson has died. Brass spends his time trying to get Martinez to confess Morales ordered his attack. After Martinez dies, Brass fakes hearing a deathbed confession and has Morales moved to solitary. He, Howell and Murphy then injure Morales in the same way as Brass. After Vahue is paroled, Brass tries to maintain contact with him, though Vahue is dismissive. Brass then tries to kill Vahue and is arrested.
• Eleanor O'Connor (Ellen McElduff, Seasons 4-6) – A woman hired as the Liaison to the Governor's office, also McManus' ex-wife. Though hired to further Devlin's interests within the prison, she ends up siding with the staff on most issues and starts a relationship with Glynn. After Devlin's involvement in Glynn's murder is revealed, she abuses Devlin and quits her position.
• Suzanne Fitzgerald (Betty Buckley, Seasons 4-6) – Inmate Ryan O'Reily's biological mother, though O'Reily was unaware of her existence. She ran away while O'Reily was a baby after being involved in a violent protest. She comes forward to admit her crime and is sentenced to community service at Oz. She works as a musical arts teacher and organizes the inmates to stage a production of Macbeth. Formerly had a relationship with Neema. Suzanne leaves USA and moves to another country in Europe.
• Tariq Faraj (Aasif Mandvi, Season 5) – An Arab dentist assigned to treat Robson's gum disease by performing a tissue graft operation. Infuriated by Robson's insults, he uses gum tissue from the body of a black man and arranges for the other inmates to learn this fact. Robson attacks Faraj once he hears the details, but Faraj knocks him out and has him sent to the Hole.
• Stella Coffo (Patti LuPone, Season 6) – The librarian of Oz. Adored by Robert Rebadow (who works with her in the library), she is reserved in returning his affection because of his reaction to her breast cancer diagnosis.
• Nurse Carol Grace (Catherine Wolf) – A nurse who works in the hospital ward with Dr Nathan. She murders those she considers 'bad men', including Martinez and Morales. Dr Nathan realizes her crimes and she is arrested.
• Dr. Frederick Garvey (Milo O'Shea, Season 3) - A callous, incompetent doctor who takes over the medical ward after Devlin makes a deal with the private contractor Garvey works for. He is fired and publicly disgraced after it is discovered that he previously ran a back-alley abortion clinic, where he had accidentally killed a patient.

Visitors

• Governor James Devlin (Željko Ivanek, Seasons 1-6) – A right-wing politician, Governor Devlin represents all extreme mechanisms of law and order to make society "crime free." He passes several acts to minimize prisoner rights and increase law enforcement spending. Disliked by several staff members and the vast majority of the inmates, Devlin eventually is in a sea of controversy once a city mayor whom he was politically involved with is sent to Oz for conspiring to commit a racially motivated bombing.
• Genevieve Beecher (Susan Floyd, Season 1) – Beecher's wife. On his first day in Oz, Rebadow informs Beecher that she is thinking of divorcing him. Despite this, she shares a conjugal visit with him but is clearly distressed by the experience. She proceeds with the divorce and moves away with the children. Some time later, she commits suicide via carbon monoxide poisoning. Though Schillinger mentions having her killed, when he later brags of his murders to Mayor Loewen he only mentions Beecher's father and son, implying that he was not involved in Genevieve's death and her death was a suicide.
• Jeremy Goldstein (Scott Cohen, Season 1) – An FBI agent who visits Oz once in the first season to investigate the murders of inmates Dino Ortolani, Johnny Post, and AIDS patient inmate, Emilio Sanchez. He experiences Anti-Semitism during his visit but manages to piece together the story.
• Alvah Case (Charles S. Dutton, Seasons 2, 4) – Law school Dean; he investigates the prison riot after season one and, in season four, runs unsuccessfully for governor against Devlin.
• Heinrick Schillinger (Dick Bocelli, Seasons 2-3) – Schillinger's father. Schillinger's sons stay with him while their father is in prison but Heinrick kicks them out when their drug habits become too much. He is as abusive as his son and they do not have a good relationship. Schillinger's sister eventually visits and telling him that Heinrick has lung cancer.
• Preston Nathan – Dr Nathan's husband. He and Dr Nathan are having marital problems in Season 1 but are back together in Season 2. After O'Reilly falls in love with Dr Nathan, he convinces his brother Cyril to murder Preston.
• Miss Sally's Schoolyard (Miss Sally played by Whitney Allen) is a puppet show that the inmates enjoy watching because Miss Sally has large breasts. Busmalis is obsessed with the show and Miss Sally; he writes her fan letters, goes to her house when he escapes Oz and is often heard remarking "This is the best Miss Sally ever". Miss Sally's Schoolyard is eventually cancelled, but Miss Sally starts a new exercise show, Sally-cise, that the inmates continue to watch.
• Tricia Ross (Arija Bareikis, Seasons 3-4) – Scott Ross's sister. She visits Oz after Saïd contacts her about the lawsuit he is bringing against the state. She and Saïd fall for each other, which leads to Saïd's deposal as leader of the Muslims and she receives threatening phone calls. She visits several times, though Saïd remains aloof with her. When the case is won, she decides to use her money to move to California and begs Saïd to tell her he loves her. Saïd refuses, saying it will make her leaving easier. She is not seen again.
• Harrison Beecher (Edward Herrmann) – Beecher's father. He lets Beecher use his law firm's resources to locate Hank Schillinger and arrange his visit. He later works to get Keller's death sentence overturned, despite his distaste for his son's lover. In order to be accepted as a member of the Brotherhood, Winthrop murders him during one of his visits.
• Angus Beecher (Jayce Bartok, Season 4) – Beecher's younger brother. He visits Beecher a few times, complaining of the pressure he feels to be the ideal lawyer, husband and father since Beecher's arrest. During one of his visits, Robson stabs him with a shank made from a bed spring, though he survives.
• Hank Schillinger (Andrew Barchilon, Seasons 1, 4, 6) – Schillinger's younger son and Carrie's husband. He lives with his grandfather until his grandfather kicks him out, at which point Schillinger loses contact with him. Beecher hires his father's law firm to locate Hank and pays him to visit his father in prison. Schillinger pays him to kidnap two of Beecher's children and murder his son, though he lets his daughter go. Hank is arrested for the crime but is let go on a technicality. Beecher hires Pancamo to arrange Hank's murder and though he tries to call it off, Hank is already dead. Since Hank indicated to his father he wanted to move to Florida, his murder is not discovered until his body is found six months later. Keller initially takes responsibility for the crime, though Pancamo is eventually discovered as the true culprit.
• Pierce Taylor (Robert John Burke, Seasons 4-6) – Another FBI agent who often visits Oz (starting in the fourth season) to investigate cases. He originally investigates the kidnapping of Beecher's children, then moves onto the murders committed by Keller. Generally very effective at his job, but insensitive to the needs of inmates. He informs Schillinger that Pancamo arranged the murder of his son Hank. He essentially replaces Jeremy Goldstein.
• Norma Clark (Michelle Schumacher, Seasons 4-6) – A former secretary to Miss Sally star, Whitney Allen. She receives Busmalis' fan letters and shows up to Oz, pretending to be Miss Sally, but her disguise does not work for long. She and Busmalis start a relationship and though she leaves him at the altar once and has a baby with her ex-boyfriend, they get back together and eventually marry.
• Carrie Schillinger (Jenna Lamia, Seasons 4-5) – Hank's wife who comes to visit Schillinger when Hank disappears following his murder. Schillinger is unaware of her existence and is initially skeptical but accepts her when she shows their marriage licence. She is pregnant and gives birth to a daughter, Jewel. A pimp in Oz tells Schillinger that Carrie worked for him as a prostitute, however a DNA test reveals that Jewel is Schillinger's granddaughter. Carrie is killed in the bus crash at the beginning of Season 5. Jewel survives and is sent to live with Carrie's parents.
• Katherine McClain (Sandra Purpuro, Seasons 4-5) – A lawyer who works towards Beecher's parole bid in Season 4. She is so certain of his being paroled that she even starts a relationship with him. After his application is rejected, they stay together. She originally works on defending Cyril O'Reily on his murder charge but recommends that the O'Reily family hire a more high-profile lawyer. Beecher later gets her to work on overturning Keller's death sentence. She is aware of Beecher's relationship with Keller, even remarking on the odd situation of representing her "boyfriend's boyfriend". After she becomes aware that Keller is guilty, she drops him as a client, breaks up with Beecher and leaves Oz.
• Perry Loftus (Christopher Jackson, Season 6) – Governor James Devlin's assistant. He plays an instrumental role in orchestrating the murder of Wilson Loewen.

Sponsors

Due to Emerald City's unconventional configuration and routine, each new inmate is given a sponsor to help acclimate. Inmates are generally paired with sponsors of similar nationality, background, race, and/or religion, to help acclimate, with the help of someone with similar interests and beliefs. Specific requests for current Emerald City prisoners to be paired up with inbound inmates have occasionally been made and granted. Below is a list of inmates and sponsors.

References

1. Gary Richard Edgerton and Jeffrey P. Jones, The Essential HBO Reader (University Press of Kentucky, 2008), 54.

• Oz (TV series) characters