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 Allan Rich D. A. Tauber Edward Grover Lombardo Albert Henderson Peluce Hank Garrett Malone Damien Leake Joey Joseph Bova Potts John Stewart Waterman Woodie King Jr. Larry James Tolkan Steiger Sal Carollo Mr. Serpico Nathan George Smith Richard Foronjy Corsaro Alan North Brown Lewis J. Stadlen Berman M. Emmet Walsh Gallagher 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 Allan Rich D. A. Tauber Edward Grover Lombardo Albert Henderson Peluce Hank Garrett Malone Damien Leake Joey Joseph Bova Potts John Stewart Waterman Woodie King Jr. Larry James Tolkan Steiger Sal Carollo Mr. Serpico Nathan George Smith Richard Foronjy Corsaro Alan North Brown Lewis J. Stadlen Berman M. Emmet Walsh Gallagher Charles White Delaney F. Murray Abraham Detective Partner (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)