Jackass is an American reality slapstick comedy television series and franchise created by Jeff Tremaine, Spike Jonze, and Johnny Knoxville. It originally aired as a TV series of three short seasons on MTV between October 2000 and August 2001, with reruns extending into 2002. The series featured a compilation of pain and embarrassment inducing stunt performances and pranks on each other and the public, with the regular cast entailing 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 and Viva La Bam; five feature films released by Paramount Pictures, four of which with expanded compilation films; a video game and a mobile game; boxed DVD sets of unreleased footage of the original TV show, a short-lived website featuring blogs and videos, merchandise, and several other videos released by various other means.

The Jackass series 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.