Audrey Hepburn - Eliza Doolittle
Rex Harrison - Professor Henry Higgins
Stanley Holloway - Alfred P. Doolittle
Wilfrid Hyde-White - Colonel Hugh Pickering
Gladys Cooper - Mrs. Higgins
Jeremy Brett - Freddy Eynsford-Hill
Theodore Bikel - Zoltan Karpathy
Mona Washbourne - Mrs. Pearce
Isobel Elsom - Mrs. Eynsford-Hill
rest of cast listed alphabetically:
John Holland - Butler
John Alderson - Jamie (uncredited)
Lois Battle - Second Maid (uncredited)
Marjorie Bennett - Cockney with Pipe (uncredited)
Oscar Beregi Jr. - Greek Ambassador (uncredited)
Betty Blythe - Lady at Ball (uncredited)
Iris Bristol - Flower Girl (uncredited)
Buddy Bryant - Prince of Transylvania (uncredited)
Walter Burke - Bystander who warns Eliza (uncredited)
Jennifer Crier - Mrs. Higgins' Maid (uncredited)
Maurice Dallimore - Selsey Man (uncredited)
Henry Daniell - Ambassador (uncredited)
Roy Dean - Footman (uncredited)
Brendan Dillon - Leading Man (uncredited)
Kai Farelli - Juggler (uncredited)
Charles E. Fredericks - King George V, in fantasy sequence (uncredited)
Ayllene Gibbons - Fat Woman at Pub (uncredited)
Jack Greening - George (uncredited)
Beatrice Grenough - Grans Lady (uncredited)
Clive Halliday - Costermonger (uncredited)
Sam Harris - Guest at Ball (uncredited)
Eric Heath - Costermonger (uncredited)
Eugene Hoffman - Juggler (uncredited)
James W. Horan - (uncredited)
Lillian Kemble-Cooper - Lady Ambassador (uncredited)
Alma Lawton - Flower Girl (uncredited)
Queenie Leonard - Cockney Bystander (uncredited)
Moyna MacGill - Lady Boxington (uncredited)
Laurie Main - Hoxton Man not Hoston (uncredited)
Owen McGiveney - Man at Coffee Stand (uncredited)
John McLiam - Harry (uncredited)
Barbara Morrison - (uncredited)
Alan Napier - Gentleman escorting Eliza to the Queen (uncredited)
Nick Navarro - Dancer (uncredited)
Marni Nixon - Eliza Doolittle (singing voice) (uncredited)
James O'Hara - Costermonger (uncredited)
Richard Peel - Costermonger (uncredited)
Barbara Pepper - Doolittle's Dance Partner (uncredited)
Olive Reeves-Smith - Mrs. Hopkins (uncredited)
Christopher Riordan - Suitor at Ball (uncredited)
Dinah Ann Rogers - First Maid (uncredited)
Victor Rogers - Policeman (uncredited)
Baroness Rothschild - Queen of Transylvania (uncredited)
Kenny Salvatt - Racegoer in 'Ascot Gavotte' Sequence (uncredited)
Miriam Schiller - Landlady (uncredited)
Bill Shirley - Freddy Eynsford-Hill (singing voice) (uncredited)
Jacqueline Squire - Parlor Maid (uncredited)
Michael St. Clair - Bartender (uncredited)
Geoffrey Steele - Taxi Driver (uncredited)
Grady Sutton - Ascot Extra/Guest at Ball (uncredited)
Gwendolyn Watts - Cook (uncredited)
Ron Whelan - Algernon/Bartender (uncredited)
Ben Wright - Footman at Ball (uncredited)
Ben Wrigley - Costermonger (uncredited)