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

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

Mick Szal
Woman on Subway

Carl Lundstedt
Wall Street Three

Michael Benz
Wall Street Three

Ben Warheit
Wall Street Three

Gary Gulman
Comedian

Sam Morril
Open Mic Comic

Chris Redd
Comedy Club Emcee

Mandela Bellamy
Mother on Bus

Demetrius Dotson II
Boy on Bus

Greer Barnes
Haha's Clown

Ray Iannicelli
Haha's Clown

Bryan Callen
Haha's Stripper

Peter Hans Benson
Good Morning Host

Vito Gerbino
Street Kid

Adam Quezada
Street Kid

Xavyer Ureña
Street Kid

Evan Rosado
Street Kid

Damian Emmanuel
Street Kid

Mike Troll
Clown Protestor

Jane Fergus
IBN Anchorwoman

David Gibson
WBC News Anchor

Tony D. Head
WGC Anchorman

Jeff McCarthy
NCB Anchor

Kim Brockington
NCB Co-Anchor

Troy Roberts
NCB News Reporter

Lou Young
ANC News Reporter

Michael-Scott Druckenmiller
Paramedic

Craig Austin
Paramedic

John Cenatiempo
Aftermath Police Officer

Danny Schoch
Aftermath Police Officers

Keith Buterbaugh
Band Leader

James Ciccone
Murray Franklin Band

Rich Campbell
Murray Franklin Band

Roger Squitero
Murray Franklin Band

Alonzo Wright
Murray Franklin Band

Mary Kate Malat
Murray Franklin Intern

Adrienne Acevedo Lovette
Middle Aged Woman (uncredited)

Justin Theroux
Ethan Chase (uncredited)

Alissa Bourne
Anna (uncredited)

Jamaal Burcher
Hospital Visitor / Mfs Audience (uncredited)

John Cashin
Arkham Patient (uncredited)

Brendan Patrick Connor
Mr. Slotnick (uncredited)

Blaise Corrigan
Taxi Driver (uncredited)

Dennis Jay Funny
Gotham Citizen (uncredited)

James P. Harkins
Thomas Wayne's Body Guard (uncredited)

Jesse Schratz
Gotham City Sick Kid (uncredited)

Isabella Ferreira
Flirting Woman on the Bus (uncredited)

Shade Rupe
Bartender (uncredited)

Michael Lepre
Arkham Insane Patient (uncredited)