Joaquin Phoenix

Arthur Fleck

Lady Gaga

Lee Quinzel

Brendan Gleeson

Jackie

Catherine Keener

Maryanne Stewart

Zazie Beetz

Sophie Dumond

Steve Coogan

Paddy Meyers

Harry Lawtey

Harvey Dent

Leigh Gill

Gary Puddles

Ken Leung

Jacob Lofland

Sharon Washington

Social Worker

Troy Fromin

E Ward Inmate (Troy Larkins)

Bill Smitrovich

Judge Herman Rothwax

John Lacy

Arkham Guard

Gattlin Griffith

Tim Dillon

Mike Houston

Guard

Jimmy Smagula

Guard

Brian Donahue

Guard

Alfred Rubin Thompson

Carson Higgins

Ben van Diepen

Music Class Singer