- Joaquin Phoenix
- Arthur Fleck
- Robert De Niro
- Murray Franklin
- Zazie Beetz
- Sophie Dumond
- Frances Conroy
- Penny Fleck
- Brett Cullen
- Thomas Wayne
- Shea Whigham
- Detective Burke
- Bill Camp
- Detective Garrity
- Glenn Fleshler
- Randall
- Leigh Gill
- Gary
- Josh Pais
- Hoyt Vaughn
- Rocco Luna
- GiGi Dumond
- Marc Maron
- Gene Ufland
- Sondra James
- Dr. Sally
- Murphy Guyer
- Barry O'Donnell
- Douglas Hodge
- Alfred Pennyworth
- Dante Pereira-Olson
- Bruce Wayne
- Carrie Louise Putrello
- Martha Wayne
- Sharon Washington
- Social Worker
- Hannah Gross
- Young Penny
- Frank Wood
- Dr. Stoner
- Brian Tyree Henry
- Carl (Arkham Clerk)
- April Grace
- Arkham Psychiatrist
- Tony D. Head
- WGC Anchorman
- Todd Phillips
- Director, Producer, Screenwriter
- Scott Silver
- Screenwriter
- Richard Baratta
- Executive Producer
- Bruce Berman
- Executive Producer
- Michael E. Uslan
- Executive Producer
- Aaron L. Gilbert
- Executive Producer
- Joseph Garner
- Executive Producer
- Walter Hamada
- Executive Producer
- Bradley Cooper
- Producer
- Emma Tillinger Koskoff
- Producer
- Lawrence Sher
- Cinematographer
- Jeff Groth
- Film Editing
- Hildur Guðnadóttir
- Original Music
- Mark Friedberg
- Production Design
- Laura Ballinger
- Art Director
- Kris Moran
- Set Decoration
- Mark Bridges
- Costume Design
- Shayna Markowitz
- Casting
