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)

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 (uncredited)

Basil Bartlett

Capt. Elliott (uncredited)

André Belhomme

French Guard (uncredited)

David Birks

Crewman (uncredited)

Robert Cawdron

"Witch of Endor" French Mate (uncredited)

Diane Cilento

Maria Hornblower (voice) (uncredited)

Howard Connell

"Lydia" Seaman (uncredited)

Alexander Davion

Spanish Officer (uncredited)

Steve Donahue

Crewman (uncredited)

Patric Doonan

Seaman (uncredited)

Anthony Forwood

Lt. Woodford (uncredited)

Arthur Gomez

French Corvette Captain (uncredited)

Lindsay Hooper

Crewman (uncredited)

Richard Johnson

Macrae (uncredited)

Howard Lang

Officer Aboard Cassandra (uncredited)

Jim Brady

Bosun's Mate (uncredited)

Fred Haggerty

Seaman (uncredited)

Sam Kydd

Seaman Garvin (uncredited)

Anthony Marlowe

Capt. Bolton (uncredited)

Michael Mellinger

Spanish Officer (uncredited)

Julio Monterde

Spanish Officer (uncredited)

Peter Morton

Hommel (uncredited)

Jack Stewart

Seaman (uncredited)

Derek Sydney

Capt. Elliott (uncredited)

Jack Taylor

Seaman (uncredited)

John A. Tinn

Juan (uncredited)

Russell Waters

Seaman (uncredited)

Del Watson

Crewman (uncredited)

Jack Watson

Capt. Sylvester (uncredited)

Byron Webster

Seaman (uncredited)

Patrick Young

Lt. Radot (uncredited)