Mason Wilson Gamble (born January 16, 1986) is an American actor known for his portrayal of Dennis Mitchell in the 1993 film Dennis the Menace and as Jason Schwartzman's sidekick, Dirk Calloway, in Wes Anderson and Owen Wilson's critically acclaimed 1998 film, Rushmore. He also appeared in Anya's Bell with Della Reese, starring as a dyslexic boy. Then in 1999 Mason took on the role Brady Lang, the son of Oliver Lang, (Tim Ribbons) in the thriller, "Arlington Road".

Gamble was born in Chicago, Illinois, the son of Sally and Tim Gamble, an actor. He graduated Oak Park and River Forest High School class of 2004 and as of 2006, he is currently attending UCLA and a member of the Pi Kappa Alpha fraternity.

Mason began his film-acting career at age six when director Harold Ramis (I) cast him in Groundhog Day (1993). Three months later, Mason won the title role in the hit comedy, Dennis the Menace (1993). He was chosen from twenty thousand other hopefuls in a nationwide casting call launched by John Hughes (I) and Warner Bros. It was an early and special opportunity to work with the gifted Walter Matthau. Mason has had starring roles in such films at Flatland Pictures' Just in Time (1996) directed by Tom Rice (I); and Morgan Creek's Bad Moon (1996) directed by Eric Red, also starring Mariel Hemingway. Among his other film credits, Mason had a wonderful experience working with Leslie Nielsen in Disney's hilarious Spy Hard (1996) directed by Rick Friedberg. He also had a role in Gattaca (1997), directed by Andrew Niccol, starring Uma Thurman and Ethan Hawke.