Jackass is an American reality comedy franchise created by Jeff Tremaine, Spike Jonze, and Johnny Knoxville. It originally aired as a television series for three short seasons on MTV between October 2000 and August 2001, with reruns extending into 2002. The show featured a cast of nine friends carrying out stunts and pranks on each other and the public. The cast included Johnny Knoxville, Bam Margera, Chris Pontius, Ryan Dunn, Steve-O, Dave England, Ehren McGhehey, Jason "Wee Man" Acuña, and Preston Lacy.

After MTV ended Jackass broadcasts in 2002, it grew into a media franchise, which includes the spin-offs Wildboyz, Viva La Bam, Homewrecker, Blastazoid, Bam's Unholy Union, Dr. Steve-O, Bam's World Domination, and Bam's Bad Ass Game Show; nine feature films released by Paramount Pictures, four with expanded DVD versions; a video game; a mobile game, a DVD of unreleased bits not used in the original TV show, a short-lived website featuring blogs and videos, merchandise, and several other videos released by various other means.

Jackass was controversial due to its perceived indecency and potential encouragement of dangerous behavior. The show placed 68th on Entertainment Weekly's "New TV Classics" list, and is a significant part in 2000s American popular culture.