Russell Crowe as John Nash

Jennifer Connelly as Alicia Nash

Ed Harris as William Parcher

Paul Bettany as Charles Herman

Christopher Plummer as Dr. Rosen

Adam Goldberg as Richard Sol

Josh Lucas as Martin Hansen

Anthony Rapp as Bender

Jason Gray-Stanford as Ainsley Neilson

Judd Hirsch as Helinger

Austin Pendleton as Thomas King

Vivien Cardone as Marcee

Jillie Simon as Bar Co-Ed

Victor Steinbach as Professor Horner

Tanya Clarke as Becky

Thomas F. Walsh as Captain

Jesse Doran as General

Kent Cassella as Analyst

Patrick Blindauer as MIT Student

John Blaylock as Photographer

Roy Thinnes as Governor

Anthony Easton as Young Man

Cheryl Howard as Harvard Administrator

Rance Howard as White-Haired Patient

Jane Jenkins as Code-Red Nurse

Darius Stone as Adjunct

Josh Pais as Princeton Professor

Alex Toma as Toby

Valentina Cardinalli as Joyce

Teagle F. Bougere as Young Professor

David B. Allen as John Nash Jr. (Teenager)

Michael Esper as John Nash Jr. (Young Man)

Eva Burkley as Girl at Bar

Amy Walz as Blond in Bar

Tracey Toomey as Brunette

Jennifer Weedon as Brunette

Yvonne Thomas as Brunette

Holly Pitrago as Brunette

Isadore Rosenfeld as Pen Ceremony Professor

Tommy Allen as Pen Ceremony Professor

Dave Bayer as Pen Ceremony Professor

Brian Keith Lewis as Pen Ceremony Professor

Tom McNutt as Pen Ceremony Professor

Will Dunham as Pen Ceremony Professor

Glenn Roberts as Pen Ceremony Professor

Ed Jupp Jr. as Pen Ceremony Professor

Christopher Stockton as Princeton Student

Gregory Dress as Princeton Student

Carla Occhiogrosso as Princeton Student

Matt Samson as Princeton Student

Lyena Nomura as Princeton Student

Kathleen Fellegara as Insulin Treatment Nurse

Betsy Klompus as Insulin Treatment Nurse

Stelio Savante as Technician

Logan McCall as Technician

Bob Broder as Technician

Scott Fernstrom as Trent Humphres (uncredited)

Ron Howard as Man at Governor's Ball (uncredited)

Bryce Dallas Howard as Harvard Student (uncredited)

Michael Arthur as Army Captain (uncredited)

Brian Smyj as Army Soldier (uncredited)

Michael C. Pierce as Radio Operator (uncredited)

Alex Lorre as Technician (uncredited)

John H. Tobin as Shadow Figure (uncredited)

James Whalen as Construction Chief (uncredited)

Nick Oddo as Noisy Construction Worker (uncredited)

Ty Copeman as Doctor (uncredited)

Jonah Falcon as Mental Patient (uncredited)

Reggie Austin as Pen Ceremony Professor (uncredited)

Robert Myers as Professor (uncredited)

Dave Sweeney as Campus Cop (uncredited)

Berly Ellis as Princeton Tutor '78 (uncredited)

Michael Abbott Jr. as Princeton Library Tutor (uncredited)

Liche Ariza as Princeton Student (uncredited)

Peter Bonilla as Princeton Student (uncredited)

Evan Hart as Princeton Student (uncredited)

Jason Horton as Princeton Student (uncredited)

Vivian Kalinov as Princeton Student (uncredited)

Dory Manzour as Princeton Student (uncredited)

Tiffany Marz as Princeton Student (uncredited)

Ryan O'Connor as Princeton Student (uncredited)

Deborah Rayne as Princeton Student (uncredited)

Colby Ryan as Princeton Student (uncredited)

Douglas Taurel as Princeton Student (uncredited)

Jeffrey Christopher Todd as Princeton Student (uncredited)

Ryan Tygh as Princeton Math Grad (uncredited)

Erik Van Wyck as Princeton Student (uncredited)

Cade Bittner as Harvard Student (uncredited)

Fabrizio Fante as Harvard Student (uncredited)

Seth Gabel as Harvard Student (uncredited)

Monique Marissa Lukens as Harvard Student (uncredited)

Phil Cirincione as MIT Student (uncredited)

Scott Addison Clay as MIT Student (uncredited)

Michael Fiore as MIT Student (uncredited)

Reed Penney as MIT Student (uncredited)

Sean Bennett as Student (uncredited)

Rich Bryant as Student (uncredited)

Jersey Carell as Student (uncredited)

Gregory Gordon as Student (uncredited)

Jarred Treiber as Student (uncredited)