Stuart Gage Lancaster (November 30, 1920 – December 22, 2000) was an American actor known for roles in Russ Meyer films.

Born in Evanston, Illinois, Lancaster's grandfather was circus owner Charles Ringling.

He served as an aviator in the United States Navy in World War II.

Lancaster appeared in several Meyer films, including Mudhoney, Faster, Pussycat!

Lancaster was the founder and director of the Palm Tree Playhouse in Sarasota, Florida.