Chris Pratt as Peter Quill / Star-Lord

Zoe Saldaña as Gamora

Dave Bautista as Drax

Vin Diesel as Baby Groot (voice)

Bradley Cooper as Rocket (voice)

Kurt Russell as Ego

Michael Rooker as Yondu

Karen Gillan as Nebula

Pom Klementieff as Mantis

Sylvester Stallone as Stakar Ogord

Elizabeth Debicki as Ayesha

Chris Sullivan as Taserface

Sean Gunn as Kraglin / On-Set Rocket

Tommy Flanagan as Tullk

Laura Haddock as Meredith Quill

Aaron Schwartz as Young Ego Facial Reference

Hannah Gottesman as Sovereign Chambermaid

Hilty Bowen as Sovereign Pilot

Ben Browder as Sovereign Admiral

Alex Klein as Zylak

Luke Cook as Zylak's Frenemy

Evan Jones as Retch

Joe Fria as Oblo

Terence Rosemore as Narblik

Jimmy Urine as Halfnut

Stephen Blackehart as Brahl

Steve Agee as Gef

Blondy Baruti as Huhtar

Richard Christy as 'Down There!'

Rob Zombie as Unseen Ravager

Sierra Love as Robot Courtesan

Kendra Carelli as Robot Courtesan

Milynn Sarley as Robot Courtesan

Seth Green as Howard the Duck (voice)

Molly C. Quinn as Howard's Date

Michael Rosenbaum as Martinex

Rhoda Griffis as Sneeper Madame

Stan Lee as Watcher Informant

David Hasselhoff as The Form of David Hasselhoff

Mac Wells as Officer Fitzgibbon

Jim Gunn Sr. as Weird Old Man

Leota Gunn as Weird Old Man's Mistress

Elizabeth Faith Ludlow as Easik Mother

Wyatt Oleff as Young Peter Quill

Gregg Henry as Grandpa Quill

Damita Jane Howard as Grandpa Quill's Friend

Ving Rhames as Charlie-27

Michelle Yeoh as Aleta Ogord

Mike Escamilla as Scrote (uncredited)

Miley Cyrus as Mainframe (voice) (uncredited)

Jeff Goldblum as En Dwi Gast / Grandmaster (uncredited)

Donny Carrington as Kree Monk (uncredited)

Nea Dune as Lovebot (uncredited)

Fred Galle as Sovereign Leader (uncredited)

Alphonso A'Qen-Aten Jackson as Ravager (uncredited)

Kelly Richardson as Daisy Kiu (uncredited)

Guillermo Rodriguez as Cop #2 (uncredited)

Josh Tipis as Humanoid Ravager (uncredited)

Jason Williams as Huge Guard of the Sovereign Nation (uncredited)