B
- Buddy Baer as Sgt. Riley and The Giant in Jack and the Beanstalk (1952)
- William Bakewell as Louis XIV and his twin brother in The Iron Mask (1929)
- Jonah Bobo as both Dannys in Zathura (2005)
- Beau Bridges as Louis XIV and Philip in The Fifth Musketeer (1979)
- Mel Brooks as Governor William J. LePetomaine, a Yiddish Indian chief and a World War I aviator in Blazing Saddles (1974)
- Mel Brooks as President Skroob and Yogurt in Spaceballs (1987)
- Peter Bull as Caspar Femm and Jasper Femm in The Old Dark House (1963)
- George Burns as God and Harry O. Tophet (Satan) in Oh, God! You Devil (1984)
Read more about this topic: List Of Actors Who Have Played Multiple Roles In The Same Film