- Malcolm McDowell
- Alex
- Patrick Magee
- Mr Alexander
- Michael Bates
- Chief Guard
- Warren Clarke
- Dim
- John Clive
- Stage Actor
- Adrienne Corri
- Mrs. Alexander
- Carl Duering
- Dr. Brodsky
- Paul Farrell
- Tramp
- Clive Francis
- Lodger
- Michael Gover
- Prison Governor
- Miriam Karlin
- Catlady
- James Marcus
- Georgie
- Aubrey Morris
- Deltoid
- Godfrey Quigley
- Prison Chaplain
- Sheila Raynor
- Mum
- Madge Ryan
- Dr. Branom
- John Savident
- Conspirator
- Anthony Sharp
- Minister
- Philip Stone
- Dad
- Pauline Taylor
- Psychiatrist
- Margaret Tyzack
- Conspirator
- Steven Berkoff
- Det. Const. Tom
- Lindsay Campbell
- Police Inspector
- Michael Tarn
- Pete
- David Prowse
- Julian
- Barrie Cookson
- Dr. Alcott, Ludovico Center check-in
- Jan Adair
- Handmaiden in Bible Fantasy
- Gaye Brown
- Sophisto
- Peter Burton
- Junior Minister - Minister Frederick's Aid
- John J. Carney
- Detective sergeant
- Vivienne Chandler
- Handmaiden in Bible Fantasy
- Richard Connaught
- Billyboy
- Prudence Drage
- Handmaiden in Bible fantasy
- Carol Drinkwater
- Nurse Feeley
- Lee Fox
- Desk Sergeant
- Cheryl Grunwald
- Victim of Billyboy's Gang
- Gillian Hills
- Sonietta
- Craig Hunter
- Doctor
- Shirley Jaffe
- Nurse
- Virginia Wetherell
- Stage Actress
- Neil Wilson
- Prison Check-in Officer
- Katya Wyeth
- Girl in Ascot Fantasy
- Frankie Abbott
- Rex - Police Landrover Driver / 1st Policeman at Duke of York (uncredited)
- Jack Arrow
- Mustachioed Ludovico Technician
- Joe Bartlett
- Smiley Prisoner Next to Kissy Faced Prisoner
- Roy Beck
- Prison Officer in Chapel
- Robert Bruce
- Milkbar Bouncer
- Maurice Bush
- Charlie - Security Guard Outside Alex's Ludovico Room
- Steadman Clark
- 3rd Milkbar Bouncer
- George Coulouris
- Professor
- Jeremy Curry
- Jesus Christ
- David Dawkins
- Humming Technician
- Barbie Denham
- Bar Customer
- Joe Dunne
- Gang Member
- Andros Epaminondas
- Bearded Man in Record Shop
- Helen Ford
- Old Lady at Duke of York
- Norman Gay
- BBC Producer
- Dr. Gundry
- Dr. Lidlock
- Peter Hannon
- 2nd Policeman at Duke of York
- Aidan Harrington
- Observer
- Alan Harris
- Prison Guard
- Margaret Heald
- Nurse Braindrain (who comes in with psychiatrist)
- Nicholas Hill
- Biblio Oldie / Drunk Tramp (uncredited)
- Heinrich Himmler
- Self
- Adolf Hitler
- Self
- Fred Hugh
- Biblio Oldie / Drunk Tramp (uncredited)
- Harry Hutchinson
- Tramp Beating Up Alex
- Alf Joint
- Gang Member
- Katharina Kubrick
- Girl Passing Alex in Record Store
- Viktor Lutze
- Self
- Olive Mercer
- Old Lady at Duke of York
- Lou Morgan
- Prison Guard
- Leslie Nye
- Biblio Oldie / Drunk Tramp (uncredited)
- Glenys O'Brien
- Brunette Girl
- George O'Gorman
- Record Bootik Clerk
- Nat Pearn
- Biblio Oldie / Drunk Tramp (uncredited)
- Chalmers Peddie
- Tramp beating up Alex
- Rex Rashley
- Biblio Oldie / Drunk Tramp (uncredited)
- Fred Real
- Prison Check-In
- Pat Roach
- Milkbar Bouncer
- Henry Robert
- Desk Policeman
- Billy Russell
- Professor Attacked by Alex & Droogs in Library
- Winifred Sabine
- Old Lady at Duke of York
- Len Saunders
- Tramp
- Shane Shelton
- Burbling Boy
- George Spence
- Tramp Beating Up Alex
- Guy Standeven
- Man with Flowers in Hospital
- Peter Sturgeon
- Inmate
- Tom Sye
- Biblio Oldie / Drunk Tramp (uncredited)
- Arthur Tatler
- Convict Pianist
- Robert van Kaphengst
- Inmate
- Alec Wallis
- Conspirator D.B. Da Silva
- Sister Watkins
- Dr. Lidlock's Assistant
