John Dehner (1915-1992) was an American actor in television, radio, and films, playing countless roles on TV series and in movies, usually as a mildly comical villain.

He played Paladin in a radio version of Have Gun Will Travel, the only time a show started on TV and later turned up on radio instead of the other way around. Two memorable performances were on the television series Maverick (1957) opposite James Garner in the episodes "Shady Deal At Sunny Acres" ("...if you can't trust your banker, whom can you trust?") and "Greenbacks, Unlimited." Dehner also played Pat Garrett in Gore Vidal's The Left-Handed Gun, opposite Paul Newman as Billy the Kid. Another film role for Dehner came in 1952's Scaramouche as Doutreval of Dijon.