Vivien Leigh
Emma, Lady Hamilton

Laurence Olivier
Lord Horatio Nelson

Alan Mowbray
Sir William Hamilton

Sara Allgood
Mrs. Cadogan-Lyon

Gladys Cooper
Lady Francis Nelson

Henry Wilcoxon
Captain Hardy

Heather Angel
Mary Smith

Halliwell Hobbes
Rev. Nelson

Gilbert Emery
Lord Spencer

Miles Mander
Lord Keith

Ronald Sinclair
Josiah

Luis Alberni
King of Naples

Norma Drury
Queen of Naples

Olaf Hytten
Gavin

Juliette Compton
Lady Spencer

Leonard Carey
Orderly (uncredited)

Alec Craig
Ship's Minister (uncredited)

George Davis
Gendarme (uncredited)

Russ Powell
Servant (uncredited)

Georges Renavent
Hotel Manager (uncredited)

Harry Strang
Ship's Medic (uncredited)