Gene Hackman

Harry Caul

John Cazale

Stan

Allen Garfield

William P. 'Bernie' Moran

Frederic Forrest

Mark

Cindy Williams

Ann

Michael Higgins

Paul

Elizabeth MacRae

Meredith

Teri Garr

Amy Fredericks

Harrison Ford

Martin Stett

Mark Wheeler

Receptionist

Robert Shields

The Mime

Phoebe Alexander

Lurleen

Ramon Bieri

Man at Party (uncredited)

Gian-Carlo Coppola

Boy in Church (uncredited)

Robert Duvall

The Director (uncredited)