Ben Gazzara
John Resko
Stuart Whitman
Principal Keeper
Ray Walston
Iggy
Vincent Price
Carl Carmer
Rod Steiger
Tiptoes
Broderick Crawford
Warden
Dodie Stevens
Resko's Sister
Jack Kruschen
Resko's Father
Sammy Davis Jr.
Wino
Naomi Stevens
Resko's Mother
Adam Williams
Guard
Jack Albertson
Teach
John Kellogg
Guard
Robert H. Harris
Commissioner
Carmen Phillips
Connie Resko
Timothy Carey
Nick
Myron Healey
Gunther
Lee Krieger
Stanley
Josip Elic
Vic the Barber
Arthur Malet
Storekeeper
Robert Christopher
Guard
Reggie Nalder
Greer
Kreg Martin
Guard
Susan Silo
Cathy (as an adult)
Tom Gilson
Lefty
Roland La Starza
Duke
Warren J. Kemmerling
Guard
Andy Albin
Inmate
John Close
Guard
John Dennis
Cell Block Guard
Billy Varga
Guard
Burt Lange
Gallery Man
Vincent Barbi
Painter (uncredited)
Peter Besbas
Sculptor (uncredited)
John Dierkes
Cell Block Guard (uncredited)
Bobby Gilbert
Sculptor (uncredited)
Sid Kane
Sculptor (uncredited)
Lenny Kent
Painter (uncredited)
Johnny Kern
Convict (uncredited)
Ernesto Molinari
Sculptor (uncredited)
Norman Nazarr
Sculptor (uncredited)
Norman Stevans
Sculptor (uncredited)
Robert Swimmer
Guard (uncredited)
Robert White
Guard (uncredited)