John O'Brien may refer to:
Public officials
American
- John O'Brien (Ohio politician) (1932–1985), former member of the Ohio House of Representatives
- John D. O'Brien, state senator in the 1997–1998 Massachusetts legislature
- John F. O'Brien (secretary of state) (c. 1850–1927), Secretary of State of New York, 1903–1906
- John F. O'Brien (judge) (1874–1939), New York Court of Appeals judge
- John H. O'Brien, 4th Fire Commissioner of the City of New York
- John J. O'Brien (civil servant) (1919–2001), investigated the assassination of President John F. Kennedy
- John J. O'Brien (commissioner), former commissioner of the Massachusetts Probation Service
- John P. O'Brien (1873–1951), 98th mayor of New York City
- John L. O'Brien (1911–2007), American politician in the Washington House of Representatives
Irish
- John O'Brien (bishop) (died 1767), Irish Bishop of Cork and Cloyne
- John O'Brien (Irish politician) (1794–1855), MP for Limerick City in the UK Parliament 1841–1852
- John O'Brien (priest) (1931–2008), Irish Roman Catholic priest and musician
- John Thomond O'Brien (1786–1861), Irish soldier in the Argentine War of Independence
- Joseph O'Sullivan, who assumed the name "John O'Brien" while under arrest for the 1922 assassination of Sir Henry Wilson
British
- John O'Brien (British politician) (died 1982), far right figure, onetime leader of the British National Front
- Sir Terence O'Brien (colonial administrator) (John Terence Nicholls O'Brien, 1830–1904), British surveyor, engineer and colonial governor
Canadian
- John O'Brien (admiral) (1918–1996), commander of the Royal Canadian Navy
- John O'Brien (Canadian politician) (1847–1917), merchant and member of the Legislative Assembly of New Brunswick
New Zealand
- John O'Brien (New Zealand politician) (1925–1990), New Zealand political candidate and party leader
Australian
- John O'Brien (Australian politician) (1866–1932), Member of the Queensland Legislative Assembly
- John O'Brien (Australian Army officer) (1908–1980), Australian major general and Mayor of Woollahra
Sportspeople
Baseball
- John O'Brien (outfielder) (1851–1914), baseball outfielder
- John O'Brien (second baseman) (1866–1913), baseball infielder
- Johnny O'Brien (born 1930), 1950s baseball second baseman
- Cinders O'Brien (John F. O'Brien, 1867–1892), baseball pitcher
Footballers
- John O'Brien (Dublin footballer), senior inter-county Gaelic footballer for Dublin and Round Towers, Clondalkin
- John O'Brien (Louth footballer) (born 1985), Gaelic footballer for Louth
- John O'Brien (soccer) (born 1977), American soccer player
- Jon O'Brien (born 1961), English footballer
Other sports
- John O'Brien (basketball, born 1888) (1888–1967), American basketball referee and executive
- John O'Brien (basketball, born 1916) (1916–1994), American professional basketball player in the 1940s
- John O'Brien (boxer) (1937–1979), Scottish boxer of the 1960s and '70s
- John O'Brien (cricketer, born 1961), English cricketer
- John O'Brien (Irish cricketer) (1866–1920), Irish cricketer
- John O'Brien (hurler) (born 1982), Irish hurler
- John O'Brien (rower) (1927–1995), New Zealand representative rower
- John O'Brien (tennis) (born 1932), Australian tennis player and hostage in the 2014 Sydney hostage crisis
- John O'Brien (water polo) (1931–2020), Australian Olympic water polo player
- John Ambrose O'Brien (1885–1968), founding owner of the Montreal Canadiens ice hockey team
- John O'Brien (businessman), British businessman
Other people
- John O'Brien (marine artist) (1831–1891), Canadian marine artist
- John O'Brien, the original name of stage actor John T. Raymond (1836–1887)
- John O'Brien (poet) (1878–1952), Australian priest, poet and author
- John B. O'Brien (1884–1936), American actor and director
- John O'Brien (publisher), Irish American publisher and academic
- John O'Brien (novelist) (1960–1994), American author
- John O'Brien (filmmaker) (born 1962), Vermont film director
- John O'Brien (advocate), disability inclusion advocate and writer
- John O'Brien (screenwriter), screenwriter of Fireflies and K-9
- John Roger O'Brien (1903–1982), birth name of Jack O'Brien (jazz pianist)
- Johnny B. O'Brien, one of The 2 Johnnies, Ireland
See also
Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: