Dean Jagger (November 17, 1903 in film – February 5, 1991) was an American film actor.

Born Ira Dean Jagger in Columbus Grove, Ohio, Jagger made his film debut in The Woman from Hell (1929) with Mary Astor. He became a successful character actor, without becoming a major star, and appeared in almost 100 films in a career that lasted until shortly before his death.

He received an Academy Award for Best Supporting Actor for his role in Twelve O'Clock High (1949). Other notable film roles included the 1956 British science-fiction film X the Unknown, although there was controversy when he refused to work with director Joseph Losey on this film because Losey was on the Hollywood blacklist. Losey was removed from the project after a few days shooting and replaced with Leslie Norman .

Jagger also achieved success in the television series Mr. Novak , winning Emmy Award nominations for his role, in 1964 and 1965.

He died from heart disease in Santa Monica, California.

Dean Jagger has a star on the Hollywood Walk of Fame for his contribution to motion pictures, at 1725 Vine Street.