Pat O'Brien

Pat O'Brien may refer to:

Politicians

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

Others

 * Pat O'Brien (actor) (1899–1983), American film actor
 * Pat O'Brien (guitarist) (born 1965), American guitarist for Cannibal Corpse
 * Pat O'Brien (radio and television personality) (born 1948), American sports commentator and television host
 * Pat O'Brien (rugby union) (born 1989), South African rugby union player
 * Pat O'Brien of Pat O'Brien's Bar, US cocktail maker
 * Maynard O'Brien, American football coach nicknamed Pat
 * Pat O'Brien (racing driver), 4 time Mr. Dirt 358 Modified Champion