Gregory Peck

Capt. Horatio Hornblower R.N

Virginia Mayo

Lady Barbara Wellesley

Robert Beatty

Lt. William Bush

Moultrie Kelsall

Lt. Crystal

Terence Morgan

2nd Lt. Gerard

James Kenney

Midshipman Longley

James Robertson Justice

Seaman Quist

Denis O'Dea

RAdm. Sir Rodney Leighton

Richard Hearne

Polwheal (Hornblower's Batman)

Stanley Baker

Mr. Harrison (Bosun)

Alan Tilvern

Hernandez

Christopher Lee

Spanish Captain

Michael Goodliffe

Col. Caillard - POW Escort

Eugene Deckers

French Commandant

Amy Veness

Mrs. McPhee (Hornblower's Housekeeper)

Kynaston Reeves

Adm. Lord Hood

Ronald Adam

Adm. McCartney

Diane Cilento

Maria Hornblower (voice) (uncredited)

Alexander Davion

Spanish Officer (uncredited)

Patric Doonan

Seaman (uncredited)

Anthony Forwood

Lt. Woodford (uncredited)

Arthur Gomez

French Corvette Captain (uncredited)

Richard Johnson

Macrae (uncredited)