 | Vin Diesel als The Iron Giant (voice) |
 | Eli Marienthal als Hogarth Hughes (voice) |
 | Jennifer Aniston als Annie Hughes (voice) |
 | Harry Connick Jr. als Dean McCoppin (voice) |
 | James Gammon als Foreman Marv Loach / Floyd Turbeaux (voice) |
 | Cloris Leachman als Mrs. Lynley Tensedge (voice) |
 | Christopher McDonald als Kent Mansley (voice) |
 | John Mahoney als General Rogard (voice) |
 | M. Emmet Walsh als Earl Stutz (voice) |
 | Jack Angel als Additional Voices (voice) |
 | Bob Bergen als Additional Voices (voice) |
 | Mary Kay Bergman als Additional Voices (voice) |
 | Michael Bird als Additional Voices (voice) |
 | Devon Cole Borisoff als Additional Voices (voice) |
 | Rodger Bumpass als Additional Voices (voice) |
 | Robert Clotworthy als Additional Voices (voice) |
 | Jennifer Darling als Additional Voices (voice) |
| Zack Eginton als Additional Voices (voice) |
 | Paul Eiding als Additional Voices (voice) |
 | Bill Farmer als Additional Voices (voice) |
 | Charles Howerton als Additional Voices (voice) |
 | Ollie Johnston als Additional Voices (voice) |
 | Sherry Lynn als Additional Voices (voice) |
 | Mickie McGowan als Additional Voices (voice) |
| Ryan O'Donohue als Additional Voices (voice) |
 | Phil Proctor als Additional Voices (voice) |
 | Frank Thomas als Additional Voices (voice) |
 | Patti Tippo als Additional Voices (voice) |
 | Brian Tochi als Additional Voices (voice) |
| Mark Hubley als Marky Maypo (archive sound) (uncredited) |
| Carole Jeghers als Firefighter Woman (voice) (uncredited) |
 | Jack Paar als Self (archive sound) (uncredited) |
| Sheri Galloway | First Assistant Editor |
| Marci Liroff | Casting |
| Joe Johnston | Character Designer |
| Michael Kamen | Original Music Composer |
| Michael Kamen | Orchestrator |
| Dominique Louis | Visual Development |
| Dominique Louis | Character Designer |
| Lou Romano | Visual Development |
| Lou Romano | Character Designer |
| Louis Gonzales | Layout |
| Ricardo Curtis | Animation |
| Andrew L. Schmidt | Animation |
| Greg Snyder | Assistant Editor |
| Doc Kane | ADR Mixer |
| Dennie Thorpe | Foley Artist |
| Jana Vance | Foley Artist |
| Tony Eckert | Foley Mixer |
| Dennis Leonard | Supervising Sound Editor |
| Steve Lumley | Storyboard |
| Brad Bird | Screenplay |
| Brad Bird | Director |
| Peter Sohn | Animation |
| Darren T. Holmes | Editor |
| Randy Thom | Sound Designer |
| Allison Abbate | Producer |
| Pete Townshend | Producer |
| Blake Neely | Orchestrator |
| Fergal Reilly | Storyboard |
| Fergal Reilly | Storyboard Artist |
| Will Eisner | Thanks |
| Teddy Newton | Visual Development |
| Teddy Newton | Character Designer |
| Teddy Newton | Additional Storyboarding |
| John Walker | Associate Producer |
| Stephen Schaffer | Assistant Editor |
| Aaron Parry | Production Manager |
| Yarrow Cheney | CG Animator |
| Ted Hughes | Writer |
| Ted Hughes | In Memory Of |
| Steven Wilzbach | Director of Photography |
| Greg Manwaring | Supervising Animator |
| Tim McCanlies | Screenplay |
| Troy Porter | ADR Mixer |
| Mark Andrews | Storyboard Artist |
| Ben Jones | Animation |
| Richard Bazley | Supervising Animator |
| Michael Swofford | Animation |
| Michael Price | Music Programmer |
| Lauren Faust | Animation |
| Alex Williams | Animation |
| Piet Kroon | Storyboard |
| Victor Haboush | Visual Development |
| Victor Haboush | Character Designer |
| Beau Borders | Sound Effects Editor |
| Des McAnuff | Producer |
| Richard Baneham | Animation |
| Richard Baneham | CG Animator |
| Gregory M. Gerlich | Production Sound Mixer |
| William H. Frake III | Layout |
| William H. Frake III | Head of Layout |
| Stephan Franck | Supervising Animator |
| Chris Sauve | Supervising Animator |
| Ron Hughart | CG Animator |
| Ron Hughart | Additional Storyboarding |
| Randy Myers | Animation |
| Jeffrey Lynch | Head of Story |
| Kevin O'Brien | Storyboard Artist |
| Lizbeth Velasco | Assistant Production Manager |
| Tony Fucile | Supervising Animator |
| Tony Fucile | Visual Development |
| Tony Fucile | Character Designer |
| Tony Fucile | Head of Animation |
| Jeff Etter | Animation |
| Louis Moulinet | Key Production Assistant |
| Viki Anderson | Storyboard |
| Gregory H. Watkins | Sound Re-Recording Mixer |
| Kevin E. Carpenter | Sound Re-Recording Mixer |
| Curt Schulkey | Supervising Dialogue Editor |
| David Parker | Sound Re-Recording Mixer |
| Andrea Gard | Sound Design Assistant |
| Leslie Barker | Assistant Production Manager |
| Leslie Barker | Key Production Assistant |
| Dao Le | Production Office Assistant |
| Jeannine Berger | Post Production Supervisor |
| Bill Perkins | Technical Supervisor |
| Craig R. Maras | Animation |
| Ruben Chavez | Background Designer |
| William Dely | Background Designer |
| James Finn | Background Designer |
| Nadia Vurbenova | Background Designer |
| Jennifer Yuan | Layout |
| Karen Hamrock | Layout |
| Audrey Stedman | Layout |
| Bill Thyen | Layout |
| John Williamson | Animation |
| James P. Alles | Layout |
| Laura Leganza Reynolds | Production Manager |
| Scott F. Johnston | Art Department Coordinator |
| Joel Parod | Background Designer |
| J.C. Alvarez | Assistant Production Manager |
| Emil Mitev | Layout |
| Michael Leung | CGI Director |
| Michael Leung | Visual Effects Technical Director |
| Mark Dinicola | Camera Supervisor |
| Shane Prigmore | Animation |
| Ralph Fernan | Animation |
| Kevin Johnson | Animation |
| Christopher Brooks | Music Editor |
| Steve Markowski | Storyboard |
| Steve Markowski | Supervising Animator |
| Harry Sabin | Additional Storyboarding |
| Dean Wellins | Storyboard |
| Dean Wellins | Supervising Animator |
| Dean Wellins | Storyboard Artist |
| Amy Richards | Production Manager |
| John Currin | Assistant Editor |
| Scott T. Petersen | Animation |
| Adam Henry | Animation |
| Robert Elhai | Orchestrator |
| Michael Leach | Production Assistant |
| Tanya Calderon | Production Office Assistant |
| Michael Tracy | Layout |
| Mark R.R. Farquhar | CG Animator |
| Bruce Edwards | CG Animator |
| Phil Langone | Animation |
| Derek Lee Thompson | Animation |
| Terry Claborn | Color Timer |
| Mary Helen Leasman | Foley Editor |
| Greg Gibbons | Background Designer |
| Wei M. Zhao | Background Designer |
| Roy Meurin | Animation |
| Frank 'Pepe' Merel | Foley Recording Engineer |
| Roger Vizard | Animation |
| Ann Guenther | Background Designer |
| Steve Garcia | Animation |
| Mo Henry | Negative Cutter |
| Les Major | CG Animator |
| Mark Whiting | Production Design |
| Mark Whiting | Character Designer |
| Hiroki Itokazu | Character Designer |
| Bob Davies | Supervising Animator |
| Mike L. Murphy | CG Animator |
| Alan Bodner | Art Direction |
| Jennifer Cardon Klein | Animation |
| Christopher Brock | Background Designer |
| Brad Booker | CG Animator |
| Lane Lueras | Animation |
| Melina Sydney Padua | Animation |
| Stephen McLaughlin | Scoring Mixer |
| Stephen McLaughlin | Music Score Producer |
| Vincent Truitner | CG Animator |
| Holger Leihe | Animation |
| Mark Williams | Animation |
| Jae Hyung Kim | Animation |
| Adam Dotson | CG Animator |
| Adam Burke | Animation |
| Marcelo Fernandes De Moura | Animation |
| Dennis Durrell | Background Designer |
| Craig Robertson | Background Designer |
| Lennie K. Graves | Animation |
| Sunny Ye | Production Assistant |
| Jim Van der Keyl | Animation |
| Sean Springer | Animation |
| Frederick J. Gardner III | Layout |
| Brian Kindregan | Additional Storyboarding |
| Joan Peter | Assistant Production Manager |
| Moroni Taylor | Additional Storyboarding |
| Christine Beck | Camera Operator |
| Shaunda G. Jones | Casting Associate |
| E. Tavares Black | Key Production Assistant |
| Jennisen Svendsen | Key Production Assistant |
| Jode Craig | Key Production Assistant |
| Keith Brennan | Key Production Assistant |
| Monte A. Gagnier | Key Production Assistant |
| Sam Mendlestein | Key Production Assistant |
| Zeba Fahid | Production Accountant |
| André Bivins | Production Assistant |
| Anthony Lauro | Production Assistant |
| Cirilo R. Gonzales Jr. | Production Assistant |
| Corrine Salgado | Production Assistant |
| Dustin Ellis | Production Assistant |
| Helen Vuong | Production Assistant |
| Henri Hovhanesyan | Production Assistant |
| Jean M. Klanecky | Production Assistant |
| Justin Balch | Production Assistant |
| Kathy Tajbakhsh | Production Assistant |
| Jessica Dalton | Production Assistant |
| John 'Juke' Logan | Music Consultant |
| Preston Oliver | Projection |
| Preston Oliver | Music Arranger |
| Yin Cantor | Assistant Sound Editor |
| Glenn Storm | CG Animator |
| Minhee Choe | CG Animator |
| Stéphane Cros | CG Animator |
| Yair Kantor | CG Animator |
| Andrew Brownlow | CG Animator |
| Grace Dotson | CG Animator |
| Susan Oslin | CG Animator |
| Carla Fallberg | Sculptor |
| Laura L. Corsiglia | Visual Development |
| Laura L. Corsiglia | Character Designer |
| Ray Aragon | Visual Development |
| Ray Aragon | Character Designer |
| Conor Kavanagh | Layout |
| Craig Voigt | Layout |
| Felipe Morell | Layout |
| Francis Lang | Layout |
| Lisa Souza | Layout |
| Teresa Coffey-Wellins | Layout |
| Ron Roesch | Layout |
| Virginie Foucault | Assistant Production Manager |
| Leonard B. Vasquez | Assistant Production Manager |
| Michelle Perslow | Assistant Production Manager |
| Marнa Guerra | Assistant Production Manager |
| Shannyn Gardner | Assistant Production Manager |
| Sharon K. O'Neill | Assistant Production Manager |
| Chrisie Rosenthal | Assistant Production Manager |
| Jonathan Salt | Background Designer |
| Teddy T. Yang | Character Designer |
| Craig Valde | Animation |
| Ken Hettig | Animation |
| Mike Chavez | Animation |
| Russell Hall | Animation |
| Ruth Daly | Animation |
| Ernie Keen | Animation |
| Mike Nguyen | Supervising Animator |
| Wendy Perdue | Supervising Animator |
| Jackie Blaisdell | Assistant Production Manager |
