- Oskar Werner as Montag
- Julie Christie as Linda Montag/Clarisse
- Cyril Cusack as Captain
- Anton Diffring as Fabian
- Jeremy Spenser as Man with the Apple
- Bee Duffell as Book Woman
- Alex Scott as Book Person
- Gillian Aldam as Judoka Woman (uncredited)
- Michael Balfour as Machiavelli's The Prince (uncredited)
- Ann Bell as Doris (uncredited)
- Yvonne Blake as The Jewish Question (uncredited)
- Arthur Cox as Male Nurse (uncredited)
- Frank Cox as Prejudice (uncredited)
- Fred Cox as Pride (uncredited)
- Noel Davis as Cousin Midge, the TV personality (uncredited)
- Judith Drinan as Plato's Republic (uncredited)
- Kevin Elder as Robert, the First Schoolboy (uncredited)
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- Joan Francis as Telephonist (uncredited)
- Denis Gilmore as The Martian Chronicles (uncredited)
- David Glover as The Pickwick Papers (uncredited)
- Arthur Haynes as Man on Commuter Train (uncredited)
- Caroline Hunt as Helen (uncredited)
- Edward Kaye as Judoka Man (uncredited)
- Mark Lester as Second Schoolboy (uncredited)
- Gillian Lewis as TV Announcer (uncredited)
- Eric Mason as Male Nurse (uncredited)
- Charlie McFadden as Nervous Man at Post Box (uncredited)
- Roma Milne as Clarisse's Neighbor (uncredited)
- Michael Mundell as Trainee Stoneman (uncredited)
- Anna Palk as Jackie (uncredited)
- Donald Pickering as TV Announcer (uncredited)
- John Rae as Weir of Hermiston (uncredited)
- Tom Watson as Instructor Sergeant (uncredited)
- Chris William as Trainee Black (uncredited)
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