Thomas or Tom Hagen may refer to:
Thomas Hagen (politician) (1919–1985), New Caledonian politician Thomas B. Hagen (born 1935/36), American billionaire businessman Tom Hagen, a fictional character in The Godfather Tom Hagen (businessman) (born 1950), Norwegian businessman Tom Harald Hagen (born 1978), Norwegian football referee
See also Thomas Hagan (born 1941), assassin of Malcolm X Tom Hagan (born 1947), American basketball player