J. Geil (J・ガイル Jei Gairu) is an antagonist appearing in Stardust Crusaders.

J. Geil is an assassin, the son of DIO's advisor Enya the Hag, sent alongside Hol Horse to kill the Joestar Group. He is also the murderer of Sherry Polnareff and the man Jean Pierre Polnareff seeks revenge from. J. Geil is a Stand User and wields Hanged Man.

Outside of combat J. Geil had an extremely twisted and depraved personality, being among the most reprehensible of DIO's minions. He made a regular habit of raping and murdering young girls, something he happily bragged about, showing zero remorse or regret for his actions.