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

Edward Grover

Lombardo

Albert Henderson

Peluce

Hank Garrett

Malone

Damien Leake

Joey

Joseph Bova

Potts

Gene Gross

Captain Tolkin

Woodie King Jr.

Larry

James Tolkan

Steiger

Ed Crowley

Barto

Bernard Barrow

Palmer

Sal Carollo

Mr. Serpico

Nathan George

Smith

Richard Foronjy

Corsaro

Alan North

Brown

Lewis J. Stadlen

Berman

Ted Beniades

Sarno

M. Emmet Walsh

Gallagher

Charles White

Delaney

F. Murray Abraham

Detective Partner (uncredited)

P.J. Benjamin

Man (uncredited)

Val Bisoglio

Weapons Storage Officer (uncredited)

John Brandon

Police Lieutenant (uncredited)

Sam Coppola

Cop (uncredited)

René Enríquez

Cervantes Teacher (uncredited)

Frank Gio

Police Lieutenant (uncredited)

Trent Gough

Cop (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)

Jay Rasumny

Television Cameraman (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