Filmography
| Year | Title | Role |
| 2009 | Hugh Hefner: Playboy, Activist and Rebel | Actor |
| 2008 | David & Fatima | Mr. Schwartz |
| 1998 | Louis & Frank | Lenny Star Springer |
| 1995 | The Celluloid Closet | Self |
| 1992 | Hollywood Babylon II | Narrator |
| 1989 | Lobster Man from Mars | J.P. Shelldrake |
| 1987 | Pack of Lies | Production Design |
| 1985 | Insignificance | The Senator |
| 1980 | Little Miss Marker | Blackie |
| 1978 | Sextette | Alexei Andrea Karansky |
| 1978 | The Manitou | Harry Erskine |
| 1978 | The Bad News Bears Go to Japan | Marvin Lazar |
| 1977 | Sex on the Run | Giacomo/Casanova |
| 1976 | The Last Tycoon | Rodriguez |
| 1975 | The Count of Monte Cristo (1908) | Fernand Mondego |
| 1975 | The Big Rip-Off | McCoy |
| 1975 | Lepke | Louis "Lepke" Buchalter |
| 1969 | Those Daring Young Men in Their Jaunty Jalopies | Chester Schofield |
| 1968 | The Boston Strangler | Albert DeSalvo |
| 1967 | Don't Make Waves | Carlo Cofield |
| 1966 | Chamber of Horrors | Mr. Julian (uncredited) |
| 1966 | Not With My Wife, You Don't! | Tom Ferris |
| 1966 | Arrivederci, Baby! | NIck Johnson |
| 1965 | The Great Race | The Great Leslie |
| 1964 | Paris When It Sizzles | Maurice/Philippe |
| 1964 | Sex and the Single Girl | Bob Weston |
| 1964 | Goodbye Charlie | George Wellington Tracy |
| 1963 | The List of Adrian Messenger | Cameo |
| 1963 | 40 Pounds of Trouble | Steve McCluskey |
| 1963 | Captain Newman, M.D. | Cpl. Jackson "Jake" Leibowitz |
| 1962 | Taras Bulba | Andrei Bulba |
| 1960 | Who Was That Lady? | David Wilson |
| 1960 | Spartacus | Antoninus |
| 1959 | Some Like It Hot (1959) | Joe/Josephine |
| 1959 | Operation Petticoat | Lt. JG Nicholas Holden |
| 1958 | The Vikings | Eric |
| 1958 | The Defiant Ones | John "Joker" Jackson |
| 1958 | Kings Go Forth | Cpl. Britt Harris |
| 1957 | The Midnight Story | Joe Martini |
| 1957 | Sweet Smell of Success | Sidney Falco |
| 1957 | Mister Cory | Cory |
| 1956 | Trapeze | Tino Orsini |
| 1955 | Six Bridges to Cross | Jerry Florea |
| 1952 | Flesh and Fury | Paul Callan |
| 1952 | Meet Danny Wilson | Self |
| 1950 | Winchester '73 | Doan |
| 1950 | CHICAGO DEADLINE/I WAS A SHOPLIFTER | Pepe |
| 1949 | The Lady Gambles | Bellboy |
| 1949 | Francis | Capt. Jones |
| 1949 | City Across the River | Mitch |
