Margot Robbie

Harley Quinn

Idris Elba

Bloodsport

John Cena

Peacemaker

Joel Kinnaman

Colonel Rick Flag

Sylvester Stallone

King Shark (voice)

Viola Davis

Amanda Waller

David Dastmalchian

Polka-Dot Man

Daniela Melchior

Ratcatcher 2

Michael Rooker

Savant

Jai Courtney

Captain Boomerang

Peter Capaldi

Thinker

Alice Braga

Sol Soria

Pete Davidson

Blackguard

Joaquín Cosío

Mayor General Mateo Suarez

Juan Diego Botto

Presidente General Silvio Luna

Storm Reid

Tyla

Nathan Fillion

T.D.K.

Taika Waititi

Ratcatcher

Steve Agee

John Economos / On-Set King Shark

Sean Gunn

Weasel / Calendar Man

John Ostrander

Doctor Fitzgibbon

Flula Borg

Javelin

Mayling Ng

Mongal

Stephen Blackehart

Briscoe

Tinashe Kajese

Flo Crawley

Jennifer Holland

Emilia Harcourt

Fernando Martinez

Sliced Dome Soldado

Dee Bradley Baker

Sebastian (voice)

Natalia Safran

Kaleidoscope

Rey Hernandez

Teniente

Ray Benitez

Coronel

Reinaldo Faberlle

Large Guerrilla

Josh Ventura

Astronaut

Gerardo Davila

General Vera

Mikaela Hoover

Camila

Lynne Ashe

Polka-Dot Man's Mom

Julio Cesar Ruiz

Milton

J.R. Adduci

Road Block Soldado

Maya Le Clark

Young Cleo

Andrea Andrade

La Gatita Waitress

Giovanni Rodriguez

Texting Torturer

Giovannie Cruz

Isabella

Sergio Carlo

Isabella's Second

Kenneth Trujillo

Bespectacled Soldado

Randy Havens

Star-Crossed Man

Michael Aaron Milligan

Star-Crossed Dude

Diany Rodriguez

Star-Crossed Gal

Terence Rosemore

Crew Chief

Lloyd Kaufman

Dancing La Gatita Bar Patron (uncredited)

Pom Klementieff

La Gatita Amable Dancer (uncredited)

Victoria Paige Watkins

Tiff (uncredited)