Eddie Deezen (b. 1958) is an American character actor, primarily cast in stereotypical nerd roles. Deezen is best known as Eugene in the film version of the musical Grease. Other Eddie Deezen films include WarGames, The Polar Express, and Laserblast, which was featured in an episode of Mystery Science Theater 3000.

Deezen's distinctive voice has earned him voice acting work as well, most notably in the role of Mandark on Dexter's Laboratory.