Hildegard Knef
— Trilby O'Farrell
Donald Wolfit
— Svengali
Terence Morgan
— Billy Bagot
Derek Bond
— Landlord
Alfie Bass
— Carrell
Noel Purcell
— Patrick O'Farrell
Jeremy Brett
— Pierre
Paul Rogers
— Taffy
David Kossoff
— Gecko
Hubert Gregg
— Durian
Harry Secombe
— Barizel
Peter Illing
— Police Inspector
Joan Haythorne
— Mrs. Bagot
Hugh Cross
— Dubose
David Oxley
— Dodor
Richard Pearson
— Lambert
Toots Pounds
— Mama Martin
Michael Craig
— Zou Zou
Neville Phillips
— Contran
Martin Boddey
— Doctor
Rica Fox
— Dresser
Joan Heal
— Barmaid
Arnold Bell
— Tout
Cyril Smith
— Stage Manager
Marne Maitland
— Stage Manager
Michael Hordern
— Billy's Uncle
Elisabeth Schwarzkopf
— Trilby O'Ferrall (singing voice)