Kenneth "Kenny" McCormick is voiced by Matt Stone (and, on one occasion, Mike Judge) and is well-known for almost always wearing his orange parka, and for being killed in nearly every episode.

Kenny's family is extremely poor. His father, Stuart McCormick, is an alcoholic, and his friends (especially Eric Cartman) often tease him about it. Kenny has two siblings: Kevin McCormick, and a little girl who seemingly has no name.

Kenny is most famous for dying in nearly every episode of the first five seasons, often followed by a cry of "Oh my God, They killed Kenny!" and "You bastard!" from his friends Stan and Kyle. In earlier seasons rats show up immediately following his death and start nibbling on his carcass.