M. Emmet Walsh
Gallagher
James Tolkan
Steiger
Al Pacino
Officer Frank Serpico
F. Murray Abraham
Detective Partner (uncredited)
Jack Kehoe
Tom Keough
Tracey Walter
Street Urchin (uncredited)
Judd Hirsch
Cop (uncredited)
Stephen Pearlman
Desk Sergeant (uncredited)
Nathan George
Smith
Jaime Sánchez
Cop (uncredited)
Tony Roberts
Bob Blair
Kenneth McMillan
Charlie (uncredited)
Biff McGuire
Captain McClain
Tony Lo Bianco
Cop (uncredited)
John Randolph
Sidney Green
Judd Omen
Doctor
Richard Foronjy
Corsaro
Alan North
Brown
Mary Louise Weller
Sally - Girl at Party (uncredited)
Barbara Eda-Young
Laurie
Cornelia Sharpe
Leslie Lane
Tom Signorelli
Bookmaker (uncredited)
Ben Slack
Detective Sitting At Desk (uncredited)
John Brandon
Police Lieutenant (uncredited)
Val Bisoglio
Weapons Storage Officer (uncredited)
Sam Coppola
Cop (uncredited)
Hank Garrett
Malone
Bernard Barrow
Palmer
Albert Henderson
Peluce
Damien Leake
Joey
George Loros
Det. Glover (uncredited)
Jay Rasumny
Television Cameraman (uncredited)
Lewis J. Stadlen
Berman
Woodie King Jr.
Larry
Edward Grover
Lombardo
RenĂ© EnrĂquez
Cervantes Teacher (uncredited)
Allan Rich
D. A. Tauber
Ted Beniades
Sarno
Joseph Bova
Potts
Richard Kuss
Detective (uncredited)
Charles White
Delaney
Sal Carollo
Mr. Serpico
John Medici
Pasquale
Trent Gough
Cop (uncredited)
Nick Hardin
Television Cameraman (uncredited)