In the animated TV program South Park, Terrance and Phillip are a comedy duo from Canada and are Kenny, Kyle, Cartman and Stan's favorite television program.

Terrance (Terrance Henry Stoot of Toronto), voiced by Matt Stone, has black hair and wears a red shirt with a letter "T," while Phillip (Phillip Niles Argyle of Montreal), voiced by Trey Parker, has blond hair and a blue shirt with a "P." The characters were inspired by the number of complaints about fart jokes in South Park. In commentary by Matt Stone and Trey Parker during the first episode Terrance and Phillip appeared, they complained of many people saying South Park was poorly animated and all fart jokes and thus invented Terrance and Phillip to demonstrate what a show that was all fart jokes would be, and made it even more poorly animated.

Terrance and Phillip are geometrically-figured with small beady eyes and Pac Man-like heads which flap up and down whenever they speak. This may originally have signified they were a crudely-animated series within another crudely-animated series, but was quickly retconned into a distinguishing feature of Canadians (other notable examples of this include Kyle's adopted brother Ike and the episode It's Christmas in Canada). An alternative theory on this is that they appear voicing themselves as animated characters in the film, and happen to look exactly the same in both cases, much like Mr. T in the Mister T animated series. Interestingly, at the beginning of South Park: Bigger, Longer & Uncut, Cartman claims that, "The animation is all crappy," but later in the movie, characters interact with them as real people. While singing Blame Canada, Sharon Marsh refers to it as "the darn cartoon".

The duo briefly separated in the episode "Terrance and Phillip: Behind the Blow," with Phillip having a "serious job" as an actor in "Canadian Shakespeare" plays. Terrance also becomes obese in this episode.