Joaquin Phoenix plays Arthur Fleck/Joker, Lady Gaga plays Lee Quinzel/Harley Quinn, and Brendan Gleeson plays Jackie Sullivan.
Main cast
- Arthur Fleck / JokerJoaquin PhoenixSeasons FilmMain
- Lee Quinzel / Harley QuinnLady GagaSeasons FilmMain
- Jackie SullivanBrendan GleesonSeasons FilmMain
- Maryanne StewartCatherine KeenerSeasons FilmMain
Supporting cast
- Sophie DumondZazie BeetzSeasons FilmSupp
- Paddy MeyersSteve CooganSeasons FilmSupp
- Harvey DentHarry LawteySeasons FilmSupp
- Gary PuddlesLeigh GillSeasons FilmSupp
- Dr. Victor LiuKen LeungSeasons FilmSupp
- Ricky MelineJacob LoflandSeasons FilmSupp
- Judge Herman RothwaxBill SmitrovichSeasons FilmSupp
- Debra KaneSharon WashingtonSeasons FilmSupp
- Ernie BullockAlfred Rubin ThompsonSeasons FilmSupp
- Young InmateConnor StorrieSeasons FilmSupp
- Music TeacherGregg DanielSeasons FilmSupp
- Arkham GuardMac BrandtSeasons FilmSupp
- Arkham GuardGeorge CarrollSeasons FilmSupp
- Arkham GuardJohn LacySeasons FilmSupp
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About this cast
Joker: Folie à Deux (2024) is a musical psychological thriller film from Warner Bros., starring Joaquin Phoenix as Arthur Fleck/Joker, Lady Gaga as Lee Quinzel/Harley Quinn, and Brendan Gleeson as Jackie Sullivan.
Cast FAQs
Who plays Arthur Fleck / Joker in Joker: Folie à Deux?
Joaquin Phoenix.
Who plays Lee Quinzel / Harley Quinn in Joker: Folie à Deux?
Lady Gaga.
Who plays the Young Inmate in Joker: Folie à Deux?
Connor Storrie.
How many cast members are in Joker: Folie à Deux?
18 cast members.
Sources: IMDb · IMDb · Rotten Tomatoes · Radio Times · ODEON Cinemas · Updated June 2026
Related cast guide: Joker