- Gregory Peck
- Capt. Horatio Hornblower R.N
- Virginia Mayo
- Lady Barbara Wellesley
- Robert Beatty
- Lt. William Bush
- Moultrie Kelsall
- Lt. Crystal
- Denis O'Dea
- RAdm. Sir Rodney Leighton
- James Kenney
- Midshipman Longley
- Terence Morgan
- 2nd Lt. Gerard
- James Robertson Justice
- Seaman Quist
- Richard Hearne
- Polwheal (Hornblower's Batman)
- Michael Dolan
- Surgeon Gundarson
- Stanley Baker
- Mr. Harrison (Bosun)
- Alan Tilvern
- Hernandez
- Alec Mango
- El Supremo (Don Julian Alvarado)
- Christopher Lee
- Spanish Captain
- John Witty
- Capt. Entenza
- Michael Goodliffe
- Col. Caillard - POW Escort
- Eugene Deckers
- French Commandant
- Ingeborg von Kusserow
- Hebe (Lady Barbara's Maid)
- Amy Veness
- Mrs. McPhee (Hornblower's Housekeeper)
- Kynaston Reeves
- Adm. Lord Hood
- Ronald Adam
- Adm. McCartney
- Chris Adcock
- Crewman
- Basil Bartlett
- Capt. Elliott
- André Belhomme
- French Guard
- David Birks
- Crewman
- Jim Brady
- Bosun's Mate
- Robert Cawdron
- French Mate on 'Witch of Endor'
- Diane Cilento
- Maria Hornblower
- Howard Connell
- Seaman on 'Lydia'
- Alexander Davion
- Spanish Officer
- Steve Donahue
- Crewman
- Patric Doonan
- Seaman
- Anthony Forwood
- Lt. Woodford
- Arthur Gomez
- French Corvette Captain
- Fred Haggerty
- Seaman
- Lindsay Hooper
- Crewman
- Richard Johnson
- Macrae
- Sam Kydd
- Seaman Garvin
- Howard Lang
- Officer Aboard Cassandra
- Anthony Marlowe
- Capt. Bolton
- Michael Mellinger
- Spanish Officer
- Julio Monterde
- Spanish Officer
- Peter Morton
- Hommel
- Stuart Pearless
- Seaman on 'Lydia'
- Raymond Sherry
- Seaman on 'Lydia'
- Jack Stewart
- Seaman
- Derek Sydney
- Capt. Elliott
- Jack Taylor
- Seaman
- John A. Tinn
- Juan
- Russell Waters
- Seaman
- Del Watson
- Crewman
- Jack Watson
- Capt. Sylvester
- Byron Webster
- Seaman
- Patrick Young
- Lt. Radot
