Best in Show is a 2000 American mockumentary comedy film co-written by Christopher Guest and Eugene Levy and directed by Guest. The film follows five entrants in a prestigious dog show, and focuses on the slightly surreal interactions among the various owners and handlers, as they travel to the show and then compete during the show. There are also short depictions of the characters six months after the show is over. Among the comedic aspects of the film are similarities between the personalities and characteristics of the owners and those of their dogs. Much of the dialogue was improvised.

Best in Show received critical acclaim. The film has a 94% approval rating on Rotten Tomatoes, based on 112 reviews, with an average rating of 7.53/10. The website's critical consensus reads, "A fine example of writer/director/star Christopher Guest's gift for improv comedy, Best in Show boasts an appealingly quirky premise and a brilliantly talented cast". The film also has a score of 78 out of 100 on Metacritic, based on 33 critics, indicating "generally favorable reviews". It won American, British, and Canadian Comedy Awards. The film is number 38 on Bravo's "100 Funniest Movies".