Matt Damon

Will Hunting

Robin Williams

Sean Maguire

Ben Affleck

Chuckie Sullivan

Stellan Skarsgård

Gerald Lambeau

Minnie Driver

Skylar

Casey Affleck

Morgan O'Mally

Cole Hauser

Billy McBride

Vik Sahay

MIT Student

John Mighton

Tom

Rachel Majorowski

Krystyn

Colleen McCauley

Cathy

Matt Mercier

Barbershop Quartet #1

Ralph St. George

Barbershop Quartet #2

Rob Lynds

Barbershop Quartet #3

Dan Washington

Barbershop Quartet #4

Alison Folland

MIT Student

Derrick Bridgeman

MIT Student

Shannon Egleson

Girl on Street

Rob Lyons

Carmine Scarpaglia

Steven Kozlowski

Carmine Friend #1

Jennifer Deathe

Lydia

Scott William Winters

Clark

Philip Williams

Head Custodian

Patrick O'Donnell

Assistant Custodian

Kevin Rushton

Courtroom Guard

Jimmy Flynn

Judge Malone

Joe Cannon

Prosecutor

Ann Matacunas

Court Officer

George Plimpton

Psychologist

Francesco Clemente

Hypnotist

Jessica Morton

Bunker Hill Student

Barna Moricz

Bunker Hill Student

Libby Geller

Toy Store Cashier

Chas Lawther

MIT Professor

Richard Fitzpatrick

Timmy

Frank Nakashima

Executive #1

Chris Britton

Executive #2

David Eisner

Executive #3

Bruce Hunter

NSA Agent

Robert Talvano

NSA Agent #2

James Allodi

Security Guard

Michael Arthur

Reunion Guest (uncredited)

Christian Harmony

Student (uncredited)

Riva Di Paola

MIT Student (uncredited)

Harmony Korine

Hervé (uncredited)

Thomas Lundy

Waiter (uncredited)

Paul McGillicuddy

Race Track Fan (uncredited)

Daniel Olsen

MIT Student (uncredited)

Stephen L'Heureux

Bartender (uncredited)