 Gregory PeckCapt. Keith Mallory | Capt. Keith Mallory |
 David NivenCpl. John Anthony Miller | Cpl. John Anthony Miller |
 Anthony QuinnCol. Andrea Stavros | Col. Andrea Stavros |
 Stanley BakerPvt. 'Butcher' Brown | Pvt. 'Butcher' Brown |
 Anthony QuayleMaj. Roy Franklin | Maj. Roy Franklin |
 James DarrenPvt. Spyros Pappadimos | Pvt. Spyros Pappadimos |
 Irene PapasMaria Pappadimos | Maria Pappadimos |
 Gia ScalaAnna | Anna |
 James Robertson JusticeCommodore Jensen / Prologue Narrator | Commodore Jensen / Prologue Narrator |
 Richard HarrisSquadron Leader Howard Barnsby RAAF | Squadron Leader Howard Barnsby RAAF |
 Bryan ForbesCohn | Cohn |
 Allan CuthbertsonMaj. Baker | Maj. Baker |
 Michael TrubshaweWeaver | Weaver |
 Percy HerbertSgt. Grogan | Sgt. Grogan |
| GGeorge MikellSS Hauptman Sessler | SS Hauptman Sessler |
 Walter GotellMuesel | Muesel |
 Tutte LemkowNicolai | Nicolai |
 Albert LievenCommandant | Commandant |
 Norman WoolandGroup Captain | Group Captain |
 Kleo SkouloudiBride | Bride |
| NNicholas PapakonstantinouPatrol Boat Captain | Patrol Boat Captain |
 Christopher RhodesGerman Gunnery Officer | German Gunnery Officer |
| WWilliam Hoehne Jr.German Officer on Navarone | German Officer on Navarone |
| AAndrew AndreasWedding Guest (uncredited) | Wedding Guest (uncredited) |
| VVictor BeaumontGerman Officer in Gun Cave (uncredited) | German Officer in Gun Cave (uncredited) |
| JJack CooperGerman Soldier on Patrol Boat (uncredited) | German Soldier on Patrol Boat (uncredited) |
 Carl DueringGerman Radar Operator (uncredited) | German Radar Operator (uncredited) |
| PPeter EvansGerman Soldier (uncredited) | German Soldier (uncredited) |
| CChick FowlesGerman Soldier (uncredited) | German Soldier (uncredited) |
| WWolf FreesRadio Operator (uncredited) | Radio Operator (uncredited) |
