Ethel Barrymore

Herself

Evelyn Rudie

Eloise

Louis Jourdan

Himself

Kay Thompson

Herself

Hans Conried

Rene the French Waiter

Charles Ruggles

Murphy

Mildred Natwick

Nanny

Jack Mullaney

Eloise's Tutor

Conrad Hilton

Himself

Maxie Rosenbloom

Himself

Monty Woolley

Himself

William Roerick

Manager of the Plaza

Inger Stevens

Joanna

Bartlett Robinson

Eloise's Lawyer

John Frankenheimer