Stanley "Stan" Marsh is one of the central characters of South Park. He is arguably the most "normal" of the kids, and is generally honest, very mature for his age, and well-meaning.

Stan is frequently embarrassed or infuriated at the stupidity of his parents and the other adults of the town, and he often goes against what his parents do. The rather displaced cynicism that he exhibits when dealing with adults, as well as his inability to be impressed by celebrities or fads may also come from the fact that, due to his parents, he has probably never respected or trusted adults. Despite this, he is well-behaved and disciplined.

Stan Marsh is a warrior from the Drow Elves and is one of the six playable partners in South Park: The Stick of Truth.