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
Maxie Rosenbloom
— Himself
Monty Woolley
— Himself
William Roerick
— Manager of the Plaza
Inger Stevens
— Joanna
Bartlett Robinson
— Eloise's Lawyer
Conrad Hilton Sr.
— Self