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)
Richard Hackman
Confessional Priest / Security Guard (uncredited)
Billy Dee Williams
Man in Yellow Hat (uncredited)