- Gene Hackman as Harry R. Caul
- John Cazale as Stanley "Stan" Ross
- Allen Garfield as William P. "Bernie" Moran
- Cindy Williams as Ann
- Frederic Forrest as Mark
- Harrison Ford as Martin Stett
- Michael Higgins as Paul
- Elizabeth MacRae as Meredith
- Teri Garr as Amy Fredericks
- Phoebe Alexander as Lurleen
- Mark Wheeler as Receptionist
- Robert Shields as The Mime
- Robert Duvall as The Director[3]
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