Peter Finch as Oscar

Yvonne Mitchell as Constance

James Mason as Edward Carson

Nigel Patrick as Sir Edward Clarke

John Fraser as Lord Alfred Douglas

Lionel Jeffries as Marquis of Queensberry

Emrys Jones as Robbie Ross

Maxine Audley as Ada Leverson

Sonia Dresdel as Lady Wilde

Meredith Edwards as Auctioneer

Lloyd Lamble as Charles Humphries

Anthony Newlands as First Clerk of Arraigns

Ian Fleming as Arthur

Michael Goodliffe as Charles Gill

Paul Rogers as Frank Harris

James Booth as Wood

Laurence Naismith as Prince of Wales

Naomi Chance as Lily Langtry

Robert Percival as Second Clerk of Arraigns

Liam Gaffney as Willie Wilde

William Kendall as Lord Ashford

Ronald Cardew as Lord Sonning

Cicely Paget-Bowman as Lady Queensberry

Derek Aylward as Lord Percy Douglas

Campbell Singer as Inspector

Victor Brooks as Constable

Alfred Burke as Reporter

A. J. Brown as Justice Collins

Charles Carson as Justice Charles

David Ensor as Justice Wills

Edward Evans as Sydney

Howard Lang as Court Usher

Gladys Henson as Landlady

John Welsh as Cafe Royal Manager