Malcolm McDowell
as Alex

Patrick Magee
as Mr. Alexander

Carl Duering
as Dr. Brodsky

Michael Bates
as Chief Guard

Warren Clarke
as Dim

James Marcus
as Georgie

Michael Tarn
as Pete

Miriam Karlin
as Catlady

Adrienne Corri
as Mrs. Alexander

Sheila Raynor
as Mum

Philip Stone
as Dad

Aubrey Morris
as Deltoid

Clive Francis
as Lodger

John Clive
as Stage Actor

Paul Farrell
as Tramp

Michael Gover
as Prison Governor

Godfrey Quigley
as Prison Chaplain

Madge Ryan
as Dr. Branom

Anthony Sharp
as Minister

Pauline Taylor
as Psychiatrist

Margaret Tyzack
as Conspirator

Steven Berkoff
as Det. Const. Tom

Lindsay Campbell
as Police Inspector

David Prowse
as Julian

Barrie Cookson
as Dr. Alcott

Jan Adair
as Handmaiden in Bible Fantasy

Gaye Brown
as Sophisto

Peter Burton
as Junior Minister

John J. Carney
as Detective Sergeant

Alec Wallis
as Conspirator D.B. Da Silva

John Savident
as Conspirator

Vivienne Chandler
as Handmaiden in Bible Fantasy

Richard Connaught
as Billyboy

Prudence Drage
as Handmaiden in Bible Fantasy

Carol Drinkwater
as Nurse Feeley

Lee Fox
as Desk Sergeant

Cheryl Grunwald
as Victim of Billyboy's Gang

Gillian Hills
as Sonietta

Craig Hunter
as Doctor

Shirley Jaffe
as Nurse

Virginia Wetherell
as Stage Actress

Neil Wilson
as Prison Check-in Officer

Katya Wyeth
as Girl in Ascot Fantasy

Jack Arrow
as Mustachioed Ludovico Technician (uncredited)

Shane Shelton
as Burbling Boy (uncredited)

Norman Gay
as BBC Producer (uncredited)

Katharina Kubrick
as Girl Passing Alex in the Record Store (uncredited)