Jeremy Renner as Jeffrey Dahmer

Bruce Davison as Lionel Dahmer

Artel Great as Rodney

Matt Newton as Lance Bell

Dionysio Basco as Khamtay

Kate Williamson as Grandma

Lily Knight as Mrs. Dahmer

Christina Payano as Letitia

Tom'ya Bowden as Shawna

Sean Blakemore as Corliss

Mickey Swenson as Officer Phillips

Julius Branca as Officer Powell

Pierson Blaetz as Officer Martin

Vincent Zangari as Ohio Officer

Xavier Lawrence as Young Man in Bar

David Manis as Shop Steward

Steve Keyes as New Guy

Daniel McInerney as Bartender

Archie Howard as Bouncer 1

Damian Forester as Bouncer 2

Christopher Louis as Corpse

Beau Clark as Party Kid (uncredited)