Filmography
| Year | Title | Role |
| 2013 | Cleopatra 50th Anniversary | Actor |
| 1984 | 1984 | O'Brien |
| 1978 | The Wild Geese | Col. Allen Faulkner |
| 1977 | Equus | Martin Dysart |
| 1977 | Exorcist II: The Heretic | Father Philip Lamont |
| 1976 | Volcano: An Inquiry Into the Life and Death of Malcolm Lowry | Narrator |
| 1974 | Brief Encounter (1975) | Alec Harvey |
| 1973 | The Voyage | Cesare Braggi |
| 1971 | Villain (1979) | Vic Dakin |
| 1969 | Where Eagles Dare | Maj. Jonathan Smith, MC |
| 1969 | Anne of the Thousand Days | King Henry VIII |
| 1969 | Staircase | Harry Leeds |
| 1968 | Boom! | Chris Flanders |
| 1968 | Candy | MacPhisto |
| 1968 | Robert Kennedy Remembered | Narrator |
| 1967 | The Taming of the Shrew (1967) | Petruchio |
| 1967 | The Comedians | Brown |
| 1966 | Who's Afraid of Virginia Woolf? | George |
| 1965 | The Spy Who Came in From the Cold | Alec Leamas |
| 1965 | The Sandpiper | Dr. Edward Hewitt |
| 1964 | The Night of the Iguana | Rev. Dr. T. Lawrence Shannon |
| 1964 | Becket | Thomas à Becket |
| 1963 | Cleopatra (1963) | Marc Antony |
| 1963 | The V.I.P.s | Paul Andros |
| 1962 | The Longest Day | Flying Officer David Campbell |
| 1960 | The Tempest (1960) | Caliban |
| 1958 | Look Back in Anger | Jimmy Porter |
| 1958 | Bitter Victory | Capt. Leith |
| 1956 | Alexander The Great (1956) | Alexander |
| 1954 | Thursday's Children | Actor |
| 1953 | The Robe | Marcellus Gallio |
| 1952 | My Cousin Rachel (1954) | Philip Ashley |
