Vin Diesel Groot (voice)
Zoe Saldaña Gamora
Chris Pratt Peter Quill
Dave Bautista Drax
Josh Brolin Thanos (uncredited)
Nathan Fillion Monstrous Inmate
Seth Green Howard the Duck (voice) (uncredited)
Stan Lee Xandarian Ladies' Man, Thanks, Executive Producer
Bradley Cooper Rocket (voice)
Benicio del Toro The Collector
John C. Reilly Corpsman Dey
James Gunn Maskless Sakaaran, Director, Writer
Laura Haddock Meredith Quill
Gregg Henry Grandpa
Glenn Close Nova Prime
Karen Gillan Nebula
Michael Rooker Yondu Udonta
Peter Serafinowicz Denarian Saal
Djimon Hounsou Korath
Bruce Mackinnon One-Eyed Ravager
Tim Williams Additional Music, Orchestrator
Lee Pace Ronan
Miriam Lucia Crying Xandarian Citizen
Nicole Alexandra Shipley Pretty Xandarian
Nick Holmes Horuz' Mate
Brendan Fehr Corpsman Dey's Partner
Ophelia Lovibond Carina
Alison Mitchell Assistant Costume Designer
Rob Zombie Ravager Navigator (voice)
Ralph Ineson Ravager Pilot
Ronan Summers 'Drop the Leg' Guard
Tomas Arana Kree Ambassador
Sharif Atkins Nova Arresting Pilot
Melia Kreiling Bereet
Leo Woodruff Stunts
Kim McGarrity Fight Choreographer
Kevin Feige Producer
Nicole Perlman Writer
Stacy Mann Publicist
Sean Gunn Kraglin / On Set Rocket
Tom Proctor Horuz
Bill Mantlo Characters
Christopher Fairbank The Broker
Ene Frost Rifle Guard
Jim Starlin Characters
Lloyd Kaufman Prisoner (uncredited)
Wyatt Oleff Young Quill
Douglas Robson Maskless Sakaaran, Stunt Double
Mikaela Hoover Nova Prime's Assistant
Naomi Ryan Nova Centurion
Ryan Stuart Stunts
John Buscema Thanks
Rashid Phoenix Stunts
Mike Friedrich Thanks
John Brotherton Nova Starblaster Pilot
Jack Kirby Thanks
Kyrsten Mate Sound Effects Editor
Max Wrottesley Sacrificed Nova Corpsman
Alexis Denisof The Other
Don Heck Thanks
Steve Gan Characters
Graham Shiels Alien Nova Pilot
David J. Grant Co-Producer
Doc Kane ADR Mixer
Rob de Groot Stunt Double
Frank Gilhooley Burly Prisoner
Jan Petřina Stunt Double
Terry Archer Costume Assistant
Tyler Bates Ravager Pilot (uncredited), Original Music Composer
Maurice Lee Stunts
Dan Abnett Comic Book
Keeley Forsyth Mottled Prisoner