Vivien Leigh as Emma, Lady Hamilton

Laurence Olivier as Lord Horatio Nelson

Alan Mowbray as Sir William Hamilton

Sara Allgood as Mrs. Cadogan-Lyon

Gladys Cooper as Lady Francis Nelson

Henry Wilcoxon as Captain Hardy

Heather Angel as Mary Smith

Halliwell Hobbes as Rev. Nelson

Gilbert Emery as Lord Spencer

Miles Mander as Lord Keith

Ronald Sinclair as Josiah

Luis Alberni as King of Naples

Norma Drury as Queen of Naples

Olaf Hytten as Gavin

Juliette Compton as Lady Spencer

Guy Kingsford as Captain Troubridge

Leonard Carey as Orderly (uncredited)

Alec Craig as Ship's Minister (uncredited)

George Davis as Gendarme (uncredited)

Payne B. Johnson as Boy (uncredited)

Russ Powell as Servant (uncredited)

Georges Renavent as Hotel Manager (uncredited)

Harry Strang as Ship's Medic (uncredited)