David Birney

as Officer Frank Serpico

Allen Garfield

as The Professor

Burt Young

as Alec Rosen

Tom Atkins

as Lt. Tom Sullivan

Lane Bradbury

as Carol

Christine Jones

as Kim

Will Kuluva

as Mr. Serpico

Walter McGinn

as David Doyle

Mario Roccuzzo

as Pasquale Serpico

Sydney Lassick

as Goldman

Anthony Charnota

as Joe Simone

Carl Lee

as Carothers

Richard C. Adams

as Atkins

Madison Arnold

as Polo

Paulette Breen

as Gina

Albert Henderson

as Sgt. Morgan

Patricia Pierangeli

as Rosa

Antony Ponzini

as Dominique

Harry Shearer

as Hippy

Frank Spalar

as Choreographer