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

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

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)

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)

Leoda Richards as Lady Exiting Ascot

Buddy Bryan as Prince of Transylvania (uncredited)