Arthur Fleck

Joaquin Phoenix

Lee Quinzel

Lady Gaga

Jackie Sullivan

Brendan Gleeson

Maryanne Stewart

Catherine Keener

Sophie Dumond

Zazie Beetz

Paddy Myers

Steve Coogan

Harvey Dent

Harry Lawtey

Gary Puddles

Leigh Gill

Dr. Victor Liu

Ken Leung

Ricky Meline

Jacob Lofland

Judge Herman Rothwax

Bill Smitrovich

Debra Kane

Sharon Washington

Ernie Bullock

Alfred Rubin Thompson

Young Inmate

Connor Storrie

Music Teacher

Gregg Daniel

Arkham Guard

Mac Brandt

Arkham Guard

Slaine

Arkham Guard

John Lacy

Arkham Guard

Tim Dillon

E Ward Inmate

Wayne DeHart

E Ward Inmate

Troy Fromin

E Ward Inmate

Ajgie Kirkland

E Ward Inmate

Terrance T.P. Polite

E Ward Inmate

Jimmy Walker Jr.

E Ward Inmate

Anthony Wilson

Dr. Louise Beatty

June Carryl

Paddy Meyers' Producer

Don McManus

Head Bailiff

G.L. McQueary

Jury Foreman

Angela D. Watson

White Chapel Minister

Murphy Guyer

Junior Associate

Carson Higgins

Masked Joker Driver

Gattlin Griffith

Joker Doppelganger

Hudson Oz

Victim's Dad

Ray Lykins

Joker Fan #1

Will Ropp

Joker Fan #2

Ashton Moio

Joker Fan #3

Emilio Rojas

Police Escort

Joe Spinney

Additional Guard

Richard Busser

Additional Guard

Brian Donahue

Additional Guard

Mike Houston

Additional Guard

Jess King

Additional Guard

Jimmy Smagula

Stan L. Brooks (voice)

Stephen Stanton

News Anchor

Martin Kildare

Reporter

Laurie Dawn

Reporter

Steven X. Greenfield

Reporter

Dominiqué Williams-Blair

Reporter

Barry Bonder

Back-up Singer

Kaylah Sharve' Baker

Back-up Singer

Ashley Levin

Back-up Singer

Celeste Butler

Music Room Pianist

Alex Wesley Smith