 | Kenneth More als Captain Jonathan Shepard |
 | Dana Wynter als WRNS Second Officer Anne Davis |
 | Carl Möhner als Captain Lindemann - 'Bismarck' |
 | Laurence Naismith als First Sea Lord Admiral Sir Dudley Pound |
 | Geoffrey Keen als Assistant Chief of the Naval Staff (A.C.N.S.) |
 | Karl Stepanek als Admiral Lutjens - 'Bismarck' |
 | Michael Hordern als Admiral Sir John Tovey, Commander-in-Chief - 'King George' |
 | Maurice Denham als Commander Richards |
 | Michael Goodliffe als Captain Banister |
 | Esmond Knight als Captain Leach - 'Prince of Wales' |
 | Jack Watling als RNVR Signals Officer |
 | Jack Gwillim als Captain Wilfrid Patterson - 'King George V' |
 | Mark Dignam als Captain Maund - 'Ark Royal' |
 | Ernest Clark als Captain Ellis - 'Suffolk' |
 | John Horsley als Captain - 'Sheffield' |
 | Peter Burton als Captain Philip Vian - 4th Destroyer of Flotilla |
 | John Stuart als Captain Kerr - 'Hood' |
 | Walter Hudd als Admiral Holland - 'Hood' |
 | Sydney Tafler als Henry - First Workman, 'Prince of Wales' |
 | Sean Barrett als Able Seaman Brown |
| Thomas Waldron Price als Flag Lieutenant to First Sea Lord |
 | Edward R. Murrow als Himself - Edward R. Murrow |
 | John Stride als Tom Shepard, Captain Shepard's son, TAG - Ark Royal's Swordfish Squadron (uncredited) |
 | Peter Dyneley als Commander Jenkins (uncredited) |
 | Victor Maddern als Able Seaman Outside Admiralty (uncredited) |
 | David Hemmings als Seaman - 'Ark Royal' (uncredited) |
 | Johnny Briggs als Seaman - 'Prince of Wales' (uncredited) |
| Norman Shelley als Voice of Winston Churchill (uncredited) |
 | John Barron als Officer P.R.O (uncredited) |
 | Harold Goodwin als Airman on Phone (uncredited) |
 | Walter Gotell als Signals Officer Mueller on the 'Bismarck' (uncredited) |
 | Sam Kydd als Civilian Worker - 'Prince of Wales' (uncredited) |
 | Glyn Houston als Able Seaman - 'Prince of Wales' (uncredited) |
 | Cameron Hall als Civilian Worker - 'Prince of Wales' (uncredited) |
| Peter Forbes-Robertson als Signalman - 'Prince of Wales' (uncredited) |
 | Michael Ripper als Able Seaman - Lookout on 'Suffolk' (uncredited) |
 | Michael Balfour als Able Seaman - Lookout on 'Suffolk' (uncredited) |
 | Graham Stark als Petty Officer Williams (uncredited) |
 | Olaf Pooley als Officer of the Watch - 'Sheffield' (uncredited) |
 | Edwin Richfield als Bridge Officer (uncredited) |
 | George Pravda als Damage Control Officer - Bismarck (uncredited) |
 | Russell Napier als Air Vice Marshal (uncredited) |
 | Edward Judd als Navigating Officer - 'Prince of Wales' (uncredited) |
 | Bernard Lee als Firing Officer (uncredited) |
 | Robert Brown als Gunnery Officer - 'King George V' (uncredited) |
| Max Butterfield als Dark Room Technician (uncredited) |
 | Mark Burns als Naval Rating on Phone (uncredited) |
 | Roy Castle als Able Seaman - 'Prince of Wales' (uncredited) |
| Victor Beaumont als Officer - 'Bismarck' (uncredited) |
| Richard Beale als Petty Officer on Phone (uncredited) |
 | Donald Churchill als Able Seaman - 'Ark Royal' (uncredited) |
 | Peter Cellier als First Lieutenant - Destroyer (uncredited) |
| Charles Houston als Airman - 'Ark Royal' (uncredited) |
 | Patrick Jordan als SOE Agent in Norway (uncredited) |
 | Ronald Leigh-Hunt als Somers - Officer 'King George V' (uncredited) |
 | Hugh Latimer als Commander - War Room (uncredited) |
 | Sean Lynch als Mail Clerk - 'Ark Royal' (uncredited) |
 | Julian Somers als Civilian Worker - 'Prince of Wales' (uncredited) |
 | Michael Sarne als Hoffman - 'Bismarck' (uncredited) |
 | Robert Desmond als Dexter (uncredited) |
 | John Bailey als Naval Officer (uncredited) |
| Michael Collins als Lookout - Second Destroyer (uncredited) |
 | John G. Heller als Lt. Becker on the 'Bismarck' (uncredited) |
 | Ian Hendry als Meteorological Officer on 'King George V' (uncredited) |
 | Ronald Hines als Officer on Bridge of 'Prince of Wales' (uncredited) |
| Lewis Gilbert | Director |
| Edmund H. North | Story |
| Edmund H. North | Screenplay |
| Clifton Parker | Original Music Composer |
| Peter R. Hunt | Editor |
| Nora Roberts | Casting |
| Christopher Challis | Director of Photography |
| John Brabourne | Producer |
| Arthur Lawson | Art Direction |
| W.T. Partleton | Makeup Artist |
| Jack Causey | Assistant Director |
| Dudley Messenger | Sound mixer |
| Red Law | Sound mixer |
| Austin Dempster | Camera Operator |
| Peter Peake | Technical Advisor |
| Mike Fox | Clapper Loader |
| Charles Van der Goor | Sound |
| C. S. Forester | Book |
