 Vivien LeighEmma, Lady Hamilton | Emma, Lady Hamilton |
 Laurence OlivierLord Horatio Nelson | Lord Horatio Nelson |
 Alan MowbraySir William Hamilton | Sir William Hamilton |
 Sara AllgoodMrs. Cadogan-Lyon | Mrs. Cadogan-Lyon |
 Gladys CooperLady Francis Nelson | Lady Francis Nelson |
 Henry WilcoxonCaptain Hardy | Captain Hardy |
 Heather AngelMary Smith | Mary Smith |
 Halliwell HobbesRev. Nelson | Rev. Nelson |
 Gilbert EmeryLord Spencer | Lord Spencer |
 Miles ManderLord Keith | Lord Keith |
 Ronald SinclairJosiah | Josiah |
 Luis AlberniKing of Naples | King of Naples |
 Norma DruryQueen of Naples | Queen of Naples |
 Olaf HyttenGavin | Gavin |
 Juliette ComptonLady Spencer | Lady Spencer |
| GGuy KingsfordCaptain Troubridge | Captain Troubridge |
 Leonard CareyOrderly (uncredited) | Orderly (uncredited) |
 Alec CraigShip's Minister (uncredited) | Ship's Minister (uncredited) |
 George DavisGendarme (uncredited) | Gendarme (uncredited) |
| PPayne B. JohnsonBoy (uncredited) | Boy (uncredited) |
 Russ PowellServant (uncredited) | Servant (uncredited) |
 Georges RenaventHotel Manager (uncredited) | Hotel Manager (uncredited) |
 Harry StrangShip's Medic (uncredited) | Ship's Medic (uncredited) |
