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

Alison Folland

MIT Student

Scott William Winters

Clark

Philip Williams

Head Custodian

Kevin Rushton

Courtroom Guard

George Plimpton

Psychologist

Richard Fitzpatrick

Timmy

Chris Britton

Executive #2

David Eisner

Executive #3

Bruce Hunter

NSA Agent

James Allodi

Security Guard

Michael Arthur

Reunion Guest (uncredited)

Christian Harmony

Student (uncredited)

Harmony Korine

Hervé (uncredited)

Daniel Olsen

MIT Student (uncredited)