Gregory Peck

Capt. Horatio Hornblower R.N

Virginia Mayo

Lady Barbara Wellesley

Robert Beatty

Lt. William Bush

Terence Morgan

2nd Lt. Gerard

James Kenney

Midshipman Longley

James Robertson Justice

Seaman Quist

Richard Hearne

Polwheal (Hornblower's Batman)

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

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 (uncredited)

Robert Cawdron

"Witch of Endor" French Mate (uncredited)

Diane Cilento

Maria Hornblower (voice) (uncredited)

Alexander Davion

Spanish Officer (uncredited)

Patric Doonan

Seaman (uncredited)

Anthony Forwood

Lt. Woodford (uncredited)

Richard Johnson

Macrae (uncredited)