Sean O'Brien may refer to: Seán O'Brien (Gaelic footballer), Gaelic footballer with Nemo Rangers Seán O'Brien (hurler) (1926–?), Irish hurler Sean O'Brien (Tipperary hurler), Irish sportsperson Sean O'Brien (ice hockey) (born 1972), American former ice hockey left winger Sean O'Brien (Ohio politician) (born 1969), Democratic member of the Ohio House of Representatives Seán O'Brien (rugby player, born 1987), Irish rugby union footballer of the 2000s and 2010s Seán O'Brien (rugby player born 1994), Irish rugby union footballer of the 2010s Sean O'Brien (windsurfer) (born 1984), Australian windsurfer Sean O'Brien (writer) (born 1952), British writer Sean O'Brien (musician), bassist and original member of Boston rock band Come Sean C. O'Brien, co-discoverer of buckminsterfullerene