 | Matt Damon als Will Hunting |
 | Robin Williams als Sean Maguire |
 | Ben Affleck als Chuckie Sullivan |
 | Stellan Skarsgård als Gerald Lambeau |
 | Minnie Driver als Skylar |
 | Casey Affleck als Morgan O'Mally |
 | Cole Hauser als Billy McBride |
 | Vik Sahay als MIT Student |
 | John Mighton als Tom |
| Rachel Majorowski als Krystyn |
| Colleen McCauley als Cathy |
| Matt Mercier als Barbershop Quartet #1 |
| Ralph St. George als Barbershop Quartet #2 |
| Rob Lynds als Barbershop Quartet #3 |
| Dan Washington als Barbershop Quartet #4 |
 | Alison Folland als MIT Student |
| Derrick Bridgeman als MIT Student |
| Shannon Egleson als Girl on Street |
| Rob Lyons als Carmine Scarpaglia |
| Steven Kozlowski als Carmine Friend #1 |
| Jennifer Deathe als Lydia |
 | Scott William Winters als Clark |
 | Philip Williams als Head Custodian |
| Patrick O'Donnell als Assistant Custodian |
 | Kevin Rushton als Courtroom Guard |
| Jimmy Flynn als Judge Malone |
| Joe Cannon als Prosecutor |
| Ann Matacunas als Court Officer |
 | George Plimpton als Psychologist |
| Francesco Clemente als Hypnotist |
 | Jessica Morton als Bunker Hill Student |
| Barna Moricz als Bunker Hill Student |
| Libby Geller als Toy Store Cashier |
| Chas Lawther als MIT Professor |
 | Richard Fitzpatrick als Timmy |
| Frank Nakashima als Executive #1 |
 | Chris Britton als Executive #2 |
 | David Eisner als Executive #3 |
 | Bruce Hunter als NSA Agent |
| Robert Talvano als NSA Agent #2 |
 | James Allodi als Security Guard |
 | Michael Arthur als Reunion Guest (uncredited) |
 | Christian Harmony als Student (uncredited) |
| Riva Di Paola als MIT Student (uncredited) |
 | Harmony Korine als Hervé (uncredited) |
| Thomas Lundy als Waiter (uncredited) |
| Paul McGillicuddy als Race Track Fan (uncredited) |
 | Daniel Olsen als MIT Student (uncredited) |
| Stephen L'Heureux als Bartender (uncredited) |
| Bob Weinstein | Executive Producer |
| Kerry Barden | Casting |
| Billy Hopkins | Casting |
| Jean-Yves Escoffier | Director of Photography |
| Beatrix Aruna Pasztor | Costume Design |
| Su Armstrong | Executive Producer |
| Lawrence Bender | Producer |
| Jaro Dick | Set Decoration |
| Suzanne Smith Crowley | Casting |
| Harvey Weinstein | Executive Producer |
| Pietro Scalia | Editor |
| Jonathan Gordon | Executive Producer |
| Missy Stewart | Production Design |
| Gus Van Sant | Director |
| James McAteer | Art Direction |
| Chris Moore | Co-Producer |
| Danny Elfman | Music |
| Jeffrey Kimball | Music Supervisor |
| Kenneth Karman | Music Editor |
| Michael "Gonzo" Gandsey | Sound Editor |
| Leslie A. Sebert | Makeup Artist |
| Bryan Forde | Gaffer |
| Richard Moore | Sound Editor |
| Owen Langevin | Sound mixer |
| Gus Van Sant | Sound Re-Recording Mixer |
| Patrick Winters | Sound Editor |
| Herb Reischl Jr. | Rigging Gaffer |
| James D. Brown | Hairstylist |
| Tom E. Dahl | Sound Re-Recording Mixer |
| George Kraychyk | Still Photographer |
| Leslie Shatz | Sound Re-Recording Mixer |
| Jery Hewitt | Stunt Coordinator |
| Kelley Baker | Supervising Sound Editor |
| Scott Mosier | Co-Executive Producer |
| Matt Damon | Writer |
| Brent O'Connor | Unit Production Manager |
| Ben Affleck | Writer |
| Robert Hackl | Post Production Supervisor |
| Brian Ricci | Utility Stunts |
| Christopher Goode | Unit Production Manager |
| Vair Macphee | Production Coordinator |
| Jennifer McNamara | Casting Associate |
| Heidi Vogel | Post Production Consulting |
| Pamela Winn-Barnett | Post Production Supervisor |
| Kevin Smith | Co-Executive Producer |
| Mark J. Casey | Electrician |
| William 'Billy Jack' Jakielaszek | Special Effects |
| William Goldman | Thanks |
| Brian Heller | Camera Operator |
| Edward Zwick | Thanks |
| Richard Linklater | Thanks |
| Kelley Dixon | First Assistant Editor |
| Terrence Malick | Thanks |
| Prudence Emery | Unit Publicist |
| Mark Fitzgerald | Location Manager |
| Elizabeth Cecchini | Hairstylist |
| Brian Ricci | Special Effects Coordinator |
| Peter Yates | Thanks |
| David McIlroy | Location Manager |
| Robert Easton | Dialect Coach |
| Gus Van Sant | Script Supervisor |
| D-J | Assistant Editor |
| David A. Cohen | Dialogue Editor |
| Pablo Ferro | Title Designer |
| Andrew Shea | First Assistant Director |
| Lisa Janowski | Second Assistant Director |
| David Till | Second Assistant Director |
| April A. Janow | Production Accountant |
| Delphine White | Wardrobe Supervisor |
| Gerri Gillan | Set Costumer |
| Marcia Scott | Set Costumer |
| Vanessa Vogel | Assistant Costume Designer |
| Mark Manchester | Key Grip |
| Malcolm Nefsky | Best Boy Grip |
| Tracy Shaw | Dolly Grip |
| Marc Corriveau | Property Master |
| Concha Solano | Assistant Sound Editor |
| Doc Kane | ADR Mixer |
| Mike Boudry | ADR Recordist |
| Margie O'Malley | Foley Artist |
| Jennifer Myers | Foley Artist |
| Marnie Moore | Foley Artist |
| Frank Rinella | Foley Recordist |
| Jennifer Deathe | Third Assistant Director |
| Dave Staples | Transportation Coordinator |
| Stuart Mitchell | Transportation Captain |
| Gary Burritt | Negative Cutter |
| Mike Mertens | Color Timer |
| Daryl Tucker | Grip |
| Stephen L'Heureux | Intern |
| Elliott Smith | Songs |
