Margot Robbie
Harleen Quinzel / Harley Quinn
Idris Elba
Robert DuBois / Bloodsport
John Cena
Christopher Smith / Peacemaker
Joel Kinnaman
Colonel Rick Flag
Sylvester Stallone
Nanaue / King Shark (voice)
Viola Davis
Amanda Waller
David Dastmalchian
Abner Krill / Polka-Dot Man
Daniela Melchior
Cleo Cazo / Ratcatcher 2
Michael Rooker
Brian Durlin / Savant
Jai Courtney
George 'Digger' Harkness / Captain Boomerang
Peter Capaldi
Gaius Grieves / The Thinker
Pete Davidson
Richard Hertz / Blackguard
Joaquín Cosío
Mayor General Mateo Suarez
Juan Diego Botto
Presidente General Silvio Luna
Nathan Fillion
Cory Pitzner / T.D.K.
Steve Agee
John Economos / On-Set King Shark
Sean Gunn
Weasel / Calendar Man
John Ostrander
Doctor Fitzgibbon
Flula Borg
Gunter Braun / Javelin
Stephen Blackehart
Briscoe
Tinashe Kajese
Flo Crawley
Jennifer Holland
Emilia Harcourt
Fernando Martinez
Sliced Dome Soldado
Dee Bradley Baker
Sebastian (voice)
Natalia Safran
Kaleidoscope
Jared Leland Gore
Double Down
Reinaldo Faberlle
Large Guerrilla
Jonathan Fritschi
Delicious Hot Dog Guerrilla
Gerardo Davila
General Vera
Lynne Ashe
Polka-Dot Man's Mom
J.R. Adduci
Road Block Soldado
Curtis Lyons Jr.
Road Block Soldado #3
Elideusa Gomes Almeida
La Gatita Presents Traditional Corto Maltese Dancer
Shanna Kernan
La Gatita Presents Traditional Corto Maltese Dancer
Bridget Taylor
La Gatita Presents Traditional Corto Maltese Dancer
Monica Rivera
La Gatita Presents Traditional Corto Maltese Dancer
Andrea Andrade
La Gatita Waitress
Giovanni Rodriguez
Texting Torturer
Sergio Carlo
Isabella's Second
Edgar Zanabria
Torn-In-Half Soldado
Grecia Balboa
Security Dispatcher
Kenneth Trujillo
Bespectacled Soldado
Randy Havens
Star-Crossed Man
Michelle Civile
Star-Crossed Woman
Gabrielle Manning
Star-Crossed Kid
Michael Aaron Milligan
Star-Crossed Dude
Diany Rodriguez
Star-Crossed Gal
Teresita Mans
Star-Crossed Lady
Terence Rosemore
Crew Chief
Lloyd Kaufman
Dancing La Gatita Bar Patron (uncredited)
Pom Klementieff
La Gatita Amable Dancer (uncredited)