Billy may refer to:
- Billy (actor), a boy who has appeared in several Troy McClure films.
- Billy (The Wife Aquatic), first mate of The Rotting Pelican.
- Gravedigger Billy, Groundskeeper Willie's Cousin.
- Billy (Homer the Great), Member of the No Homers Club
- Billy the Kid, a zombie of a feared cowboy.
- Springfield Billy, an actor from Shelbyville and parody of so-called Springfield hillbillies.
- Billy (flashback), the kid who joined No Homers society.
- Billy Kimball, writer
- Billy Corgan, Member of the Smashing Pumpkins