Dennis O'Connor may refer to: Dennis O'Connor (judge), Associate Chief Justice of Ontario J. Dennis O'Connor (born 1942), Chancellor of the University of Pittsburgh Dennis James O'Connor (1886–1946), Quebec politician Dennis O'Connor, a Québécois actor known from such movies as The Park Is Mine and Self Defense, as well as some TV series.
See also Denis O'Conor, Irish nobleman and politician Denis Charles Joseph O'Conor, Irish lawyer Denis Maurice O'Conor, Irish barrister and politician Denis O'Connor (disambiguation)