Tom Gianas (born October 29, 1964, in San Jose, California) is an American comedy writer, director and producer. Gianas is best known for producing Sarah Silverman: Jesus Is Magic and writing/directing on the MTV sketch comedy series Human Giant. He has collaborated with Bob Odenkirk, in productions such as Half My Face is A Clown and Tenacious D.

Gianas is currently working as a writer and director on Nick Swardson's Pretend Time on Comedy Central, which he co-created with Nick Swardson.