Al Pacino
Officer Frank Serpico
John Randolph
Sidney Green
Jack Kehoe
Tom Keough
Biff McGuire
Captain McClain
Barbara Eda-Young
Laurie
Cornelia Sharpe
Leslie Lane
Tony Roberts
Bob Blair
John Medici
Pasquale
Allan Rich
D. A. Tauber
Norman Ornellas
Rubello
Edward Grover
Lombardo
Albert Henderson
Peluce
Hank Garrett
Malone
Damien Leake
Joey
Joseph Bova
Potts
Gene Gross
Captain Tolkin
John Stewart
Waterman
Woodie King Jr.
Larry
James Tolkan
Steiger
Ed Crowley
Barto
Bernard Barrow
Palmer
Sal Carollo
Mr. Serpico
Mildred Clinton
Mrs. Serpico
Nathan George
Smith
Gus Fleming
Dr. Metz
Richard Foronjy
Corsaro
Alan North
Brown
Lewis J. Stadlen
Berman
John McQuade
Kellogg
Ted Beniades
Sarno
John Lehne
Gilbert
M. Emmet Walsh
Gallagher
George Ede
Daley
Charles White
Delaney
F. Murray Abraham
Detective Partner (uncredited)
P.J. Benjamin
Man (uncredited)
Don Billett
Detective Threatening Serpico (uncredited)
Val Bisoglio
Weapons Storage Officer (uncredited)
John Brandon
Police Lieutenant (uncredited)
James Bulleit
Det. Styles (uncredited)
Roy Cheverie
Cop (uncredited)
Sam Coppola
Cop (uncredited)
Marjorie Eliot
Rape Victim (uncredited)
René Enríquez
Cervantes Teacher (uncredited)
Conard Fowkes
Cop - Narcotics Raid (uncredited)
Frank Gio
Police Lieutenant (uncredited)
Trent Gough
Cop (uncredited)
Paul E. Guskin
Police Academy Classmate (uncredited)
Nick Hardin
Television Cameraman (uncredited)
Judd Hirsch
Cop (uncredited)
Richard Kuss
Detective (uncredited)
Tony Lo Bianco
Cop (uncredited)
George Loros
Det. Glover (uncredited)
Kenneth McMillan
Charlie (uncredited)
Stephen Pearlman
Desk Sergeant (uncredited)
Tim Pelt
Black Hood (uncredited)
William Pelt
Black Hood (uncredited)
Jay Rasumny
Television Cameraman (uncredited)
Franklin Scott
Black Prisoner (uncredited)
Tom Signorelli
Bookmaker (uncredited)
Ben Slack
Detective Sitting At Desk (uncredited)
Jaime Sánchez
Cop (uncredited)
Tracey Walter
Street Urchin (uncredited)
Mary Louise Weller
Sally - Girl at Party (uncredited)
Judd Omen
Doctor