Marilyn Monroe as Elsie

Laurence Olivier as The Regent

Sybil Thorndike as The Queen Dowager

Richard Wattis as Northbrook

Jeremy Spenser as King Nicolas

David Horne as The Foreign Office

Harold Goodwin as Call Boy

Gladys Henson as Dresser

Jean Kent as Maisie Springfield

Charles Victor as Theatre Manager

Daphne Anderson as Fanny

Vera Day as Betty

Gillian Owen as Maggie

Esmond Knight as Hoffman

Paul Hardwick as Major Domo

Rosamund Greenwood as Maud

Andreas Malandrinos as Valet with Violin

Margot Lister as Lottie

Aubrey Dexter as The Ambassador

Maxine Audley as Lady Sunningdale

Dennis Edwards as Head Valet

Paul Beradi as Dignitary (Uncredited)

Carole Gray as Dancer (Uncredited)

Dido Plumb as Dignitary (Uncredited)