Pat O'Brien may refer to:

Politicians

  • Pat O'Brien (Irish politician) (c. 1847–1917), Irish Nationalist MP in the United Kingdom Parliament
  • Pat O'Brien (Canadian politician) (born 1948), member of the Canadian House of Commons
  • Patrick Joseph O'Brien, (1835–1911) , Irish Nationalist MP in the United Kingdom Parliament

Others

  • Benson Harrison "Pat" O'Brien (1894–1983) of Pat O'Brien's Bar, US cocktail maker
  • Pat O'Brien (actor) (1899–1983), American film actor
  • Maynard O'Brien (1907–1990), American football coach nicknamed Pat
  • Pat O'Brien (radio and television personality) (born 1948), American sports commentator and television host
  • Pat O'Brien (guitarist) (born 1965), American guitarist for Cannibal Corpse
  • Pat O'Brien (racing driver) (born 1965), Hall of Fame modified racing driver
  • Pat O'Brien (rugby union) (born 1989), South African rugby union player

See also

  • Patrick O'Brien (disambiguation)