Why Don't You Play in Hell? (地獄でなぜ悪い, Jigoku de naze warui, literally What's so bad about hell?) is a 2013 Japanese film directed, written and scored by Sion Sono.

The movie is an action film based on a screenplay written by Sono fifteen years earlier. North American distributor Drafthouse Films announced its acquisition before it made its world premiere at the 2013 Venice Film Festival, planning a 2014 release in theatres and VOD after its premiere at the 2013 Toronto International Film Festival. At Toronto the film won the People's Choice Award in the Midnight Madness section. It won the Audience Award at L’Étrange Festival in Paris the same year after a screening that was its French premiere. Its main theme is the song of the same name, self-produced and written by film cast member Gen Hoshino.