 Kenneth WilliamsCaptain Fearless | Captain Fearless |
 Bernard CribbinsMidshipman Albert Poop-Decker | Midshipman Albert Poop-Decker |
 Juliet MillsSally | Sally |
 Charles HawtreyWalter Sweetley | Walter Sweetley |
 Donald HoustonLieutenant Jonathan Howett | Lieutenant Jonathan Howett |
 Percy HerbertMr. Angel | Mr. Angel |
 Jim DaleYoung Carrier | Young Carrier |
 Patrick CargillGovernor Don Luis | Governor Don Luis |
 Cecil ParkerFirst Sea Lord | First Sea Lord |
 Ed DevereauxHook | Hook |
 Peter GilmoreRoger | Roger |
 George WoodbridgeNed | Ned |
 Ian WilsonLightning Legs | Lightning Legs |
| JJimmy ThompsonAdmiral Horatio Nelson | Admiral Horatio Nelson |
 Anton RodgersVice-Admiral Sir Thomas Hardy | Vice-Admiral Sir Thomas Hardy |
 Michael NightingaleTown Crier | Town Crier |
 Frank ForsythSecond Sea Lord | Second Sea Lord |
 Barrie GosneyCoach Driver | Coach Driver |
| JJohn BrookingThird Sea Lord | Third Sea Lord |
| JJan MuzurusSpanish Captain | Spanish Captain |
 Viviane VenturaSpanish Secretary | Spanish Secretary |
 Marianne StonePeg | Peg |
| CChris AdcockPirate (uncredited) | Pirate (uncredited) |
| TTony AllenPirate (uncredited) | Pirate (uncredited) |
| BBernard BarnsleyDeckhand (uncredited) | Deckhand (uncredited) |
| AAlan BeatonPirate (uncredited) | Pirate (uncredited) |
| JJoe BeckettPirate / Naval Officer (uncredited) | Pirate / Naval Officer (uncredited) |
 Jim BradyPirate (uncredited) | Pirate (uncredited) |
| JJack CarterMarine (uncredited) | Marine (uncredited) |
| MMarian CollinsGirl at Dirty Dick's (uncredited) | Girl at Dirty Dick's (uncredited) |
