Audrey Hepburn
as Eliza Doolittle

Rex Harrison
as Professor Henry Higgins

Stanley Holloway
as Alfred P. Doolittle

Wilfrid Hyde-White
as Colonel Hugh Pickering

Gladys Cooper
as Mrs. Higgins

Jeremy Brett
as Freddy Eynsford-Hill

Theodore Bikel
as Zoltan Karpathy

Mona Washbourne
as Mrs. Pearce

Isobel Elsom
as Mrs. Eynsford-Hill

John Holland
as Butler

Colin Kenny
as Ad Lib at Church (uncredited)

Bert Stevens
as Gentleman (uncredited)

Frank Baker
as Gentleman (uncredited)

Marjorie Bennett
as Cockney with Pipe (uncredited)

Betty Blythe
as Lady at Ball (uncredited)

Arthur Tovey
as Singer (uncredited)

Marni Nixon
as Eliza Doolittle (singing voice) (uncredited)

Al Bain
as Cockney (uncredited)

William Beckley
as Footman (uncredited)

Lillian Kemble-Cooper
as Lady Ambassador (uncredited)

Henry Daniell
as Ambassador (uncredited)

Brendan Dillon
as Leading Man (uncredited)

Iris Bristol
as Flower Girl (uncredited)

Geoffrey Steele
as Taxi Driver (uncredited)

Charles Fredericks
as King George V (uncredited)

Maurice Dallimore
as Selsey Man (uncredited)

John Alderson
as Jamie - Doolittle's crony (uncredited)

John McLiam
as Harry (uncredited)

John Mitchum
as Ad Lib at Church (uncredited)

Alan Napier
as Gentleman Escorting Eliza to the Queen (uncredited)

Christopher Riordan
as Suitor at Ball (uncredited)

Michael St. Clair
as Bartender (uncredited)

Grady Sutton
as Ascot Extra / Guest at Ball (uncredited)

Stuart Hall
as Gentleman (uncredited)

Sam Harris
as Guest at Ball (uncredited)