 | Sigourney Weaver als Lt. Ellen Louise Ripley |
 | Michael Biehn als Cpl. Dwayne Hicks |
 | Lance Henriksen als Lance Bishop |
 | Bill Paxton als Pvt. William L. Hudson |
 | Jenette Goldstein als Pvt. Jenette Vasquez |
 | Carrie Henn als Rebecca "Newt" Jorden |
 | Paul Reiser als Carter J. Burke |
 | Mark Rolston als Pvt. Mark Drake |
 | William Hope als Lt. Scott Gorman |
 | Al Matthews als Sgt. Al Apone |
 | Colette Hiller als Cpl. Colette Ferro |
 | Ricco Ross als Pvt. Ricco Frost |
 | Daniel Kash als Pvt. Daniel Spunkmeyer |
 | Cynthia Dale Scott als Cpl. Cynthia Dietrich |
 | Tip Tipping als Pvt. Tim Crowe |
| Trevor Steedman als Pvt. Trevor "Ski" Wierzbowski |
| Paul Maxwell als Van Leuwen |
 | Valerie Colgan als ECA Rep |
 | Alan Polonsky als Insurance Man |
 | Alibe Parsons als Med Tech |
| Blain Fairman als Doctor |
| Barbara Coles als Cocooned Woman |
| Carl Toop als Aliens / Alien Queen |
 | John Lees als Power Loader Operator |
 | Mac McDonald als Al Simpson |
 | William Armstrong als Lydecker |
 | Holly De Jong als Newt's Mother (uncredited) |
 | Eddie Powell als Alien Warrior (uncredited) |
 | Jill Goldston als Worker in Corridor (Special Edition) (uncredited) |
 | Jay Benedict als Newt's Father (uncredited) |
 | Elizabeth Inglis als Amanda Ripley-Mclaren (uncredited) |
 | Stuart Milligan als Salvage Team Leader (uncredited) |
| Bob Sherman als Salvage Team Leader (voice) (uncredited) |
 | Chris Webb als Alien Warrior (uncredited) |
 | Tom Woodruff Jr. als Salvager (uncredited) |
 | Alec Gillis als Alien (uncredited) |
| Paul Weston | Stunt Coordinator |
| Ken Court | Art Direction |
| Fred Hole | Art Direction |
| Michael Clifford | Music Editor |
| Elanor Bertram | Stunts |
| James Cameron | Director |
| Ray Lovejoy | Editor |
| Norman Baillie | Special Effects |
| James Horner | Original Music Composer |
| Peter Lamont | Production Design |
| Michael Lamont | Art Direction |
| Emma Porteous | Costume Design |
| Gale Anne Hurd | Producer |
| Bert Davey | Art Direction |
| Adrian Biddle | Director of Photography |
| Crispian Sallis | Set Decoration |
| James Cameron | Screenplay |
| Brian Johnson | Special Effects |
| Terry Ackland-Snow | Supervising Art Director |
| Tiny Nicholls | Costume Supervisor |
| Mike Fenton | Casting |
| Judy Taylor | Casting |
| Mary Selway | Casting |
| Jane Feinberg | Casting |
| Shaun O'Dell | Camera Operator |
| David Worley | Camera Operator |
| Jack Thetford | Gaffer |
| Don Sharpe | Supervising Sound Editor |
| Robert Skotak | Visual Effects Supervisor |
| Dennis Skotak | Visual Effects Supervisor |
| Richard Hewitt | Visual Effects Supervisor |
| Bob Penn | Still Photographer |
| Chris Webb | Stunts |
| Robin Clarke | Music Editor |
| David Giler | Story |
| Gordon Carroll | Executive Producer |
| Walter Hill | Executive Producer |
| James Cameron | Story |
| David Giler | Executive Producer |
| Dan O'Bannon | Characters |
| Ronald Shusett | Characters |
| Walter Hill | Story |
| Vic Simpson | Construction Manager |
| Gil Whelan | Unit Production Manager |
| Ron Cobb | Conceptual Design |
| Stuart Fell | Stunts |
| Derek Cracknell | First Assistant Director |
| Melvin Lind | Second Assistant Director |
| Stan Winston | Second Unit Director |
| Louise Head | Stunt Double |
| Eddie Powell | Stunts |
| Elaine Bowerbank | Key Hair Stylist |
| Hugh Harlow | Production Supervisor |
| Rocky Phelan | Foley Editor |
| Simon Crane | Stunts |
| Sue Crosland | Stunts |
| Steve Dent | Stunts |
| Jazzer Jeyes | Stunts |
| Mo Coppitters | Unit Production Manager |
| Sean McCabe | Stunts |
| Syd Mead | Concept Artist |
| Stuart St. Paul | Stunts |
| Jason White | Stunts |
| Greig McRitchie | Orchestrator |
| Paul Tucker | Production Controller |
| Diana Dill | Script Supervisor |
| Kiran Shah | Stunt Double |
| Joyce Turner | Production Coordinator |
| Peter Boita | Associate Editor |
| Clive Curtis | Stunt Double |
| Phil Sanderson | First Assistant Editor |
| H. R. Giger | Creature Design |
| Bill Weston | Stunts |
| Malcolm Weaver | Stunts |
| Geoff Freeman | Unit Publicist |
| Peter Robb-King | Makeup Supervisor |
| Peter Russell | Visual Effects Art Director |
| Simon Harris | Assistant Editor |
| Archie Ludski | Dialogue Editor |
| Roy Charman | Sound Recordist |
| Bert Hearn | Property Master |
