Tommy Trinder

Tommy Taylor

Frances Day

Poppaea

Sonnie Hale

The Professor

Francis L. Sullivan

Nero

Diana Decker

Lydia

Elisabeth Welch

Nora

Mary Clare

Volumnia

Ernest Milton

Titus

Frederick Piper

Auctioneer

Robert Wyndham

Lionkeeper

Russell Thorndike

High Priest

Danny Green

Lictor

James Robertson Justice

Centurion of the 8th Legion

Kay Kendall

Girl (uncredited)

Alec Mango

Secretary (uncredited)

Bill Shine

Minor Role (uncredited)

Julie Suedo

Señorita Àlvarez (uncredited)

Frank Tickle

Master of Ceremonies (uncredited)