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 See also Patrick O'Brien (disambiguation)