Denis O'Dea was an Irish stage and film actor.

Odd Man Out is a 1947 British film noir directed by Carol Reed, and starring James Mason, Robert Newton, Cyril Cusack, and Kathleen Ryan. Set in Belfast, Northern Ireland, it follows a wounded Nationalist leader who attempts to evade police in the aftermath of a robbery. It is based on the 1945 novel of the same name by F. L. Green.