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)