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

Josh Lucas
as Martin Hansen

Adam Goldberg
as Richard Sol

Anthony Rapp
as Bender

Judd Hirsch
as Helinger

Jason Gray-Stanford
as Ainsley Neilson

Austin Pendleton
as Thomas King

Vivien Cardone
as Marcee

Jillie Simon
as Bar Co-Ed

Victor Steinbach
as Prof. 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

Josh Pais
as Princeton Professor

David B. Allen
as John Nash Teenager

Michael Esper
as John Nash Young Man

Erik Van Wyck
as Princeton Student

Rance Howard
as White-Haired Patient

Jane Jenkins
as Code-Red Nurse

Darius Stone
as Adjunct

Valentina Cardinalli
as Joyce

Teagle F. Bougere
as Young Professor

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

Tom McNutt
as Pen Ceremony Professor

Alex Toma
as Toby

Bryce Dallas Howard
as Student at Harvard University (uncredited)

Ryan O'Connor
as Princeton Student (uncredited)