Michael or Mike O'Brien may refer to:
Politicians
- Michael O'Brien (Fianna Fáil politician), Irish former councillor and mayor of Clonmel
- Michael O'Brien (Ohio politician) (born 1955), American politician in the state of Ohio
- Michael O'Brien (South Australian politician) (born 1949), Australian Labor Party member of the South Australian House of Assembly, 2002–present
- Micheal O'Brien (Canadian politician), Progressive Conservative Party of Canada candidate for the Canadian House of Commons
- Michael O'Brien (Victorian politician) (born 1971), Liberal Party of Australia member of the Victorian Legislative Assembly, 2006–present
- Michael H. O'Brien (1954–2018), American politician in the commonwealth of Pennsylvania
- Michael J. O'Brien (born 1939), American politician in the state of Iowa
- Michael John O'Brien (1851–1940), Canadian politician, railway builder, industrialist and philanthropist
- Mike O'Brien (British politician) (born 1954), United Kingdom Labour Party politician
- Mike O'Brien (Canadian politician), mayor of Fredericton, New Brunswick
- Mike O'Brien (Seattle politician) (born 1968), American politician
- Michael O'Brien (New Hampshire politician)
Sports
- Michael O'Brien (Australian rules footballer) (born 1980), West Coast Eagles
- Michael O'Brien (fencer) (born 1969), Irish fencer
- Michael O'Brien (hurling manager) (1933–2014), Irish Catholic priest and former hurling manager
- Michael O'Brien (Irish sportsman), Irish association footballer, Gaelic footballer and cricketer in the 1920s
- Mike O'Brien (swimmer) (born 1965), American swimmer
- Micheál O'Brien (1923–2015), Irish Gaelic footballer and hurler
- Mike O'Brien (American football) (born 1956), American football player
- Mike O'Brien (hurler) (born 1978), Irish hurler
Others
- Michael O'Brien (bishop) (1876–1952), Irish Roman Catholic bishop
- Michael O'Brien (American poet) (born 1939), American poet
- Michael O'Brien (Canadian author) (born 1948), Canadian author
- Michael O'Brien (game designer), Australian game designer
- Michael O'Brien (historian) (1948–2015), American historian
- Michael O'Brien (unionist) (born 1949 or 1950), American labor union leader
- Michael O'Brien (musician) (born 1964), American musician
- Michael O'Brien (photographer) (born 1950), American photographer
- Michael K. O'Brien, visual effects artist
- Mike O'Brien (actor) (born 1976), American writer and performer on Saturday Night Live
- Mike O'Brien (game developer), co-founder, ArenaNet; game designer and programmer
Characters
- Guardsman (Michael O'Brien), a fictional character in the Iron Man comics
- Michael O'Brien, a fictional engineer character in the 1940 Christmas film Beyond Tomorrow
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: