 Robert TaylorLieut. Gregg Masterman | Lieut. Gregg Masterman |
 Charles LaughtonRear Admiral Stephen Thomas | Rear Admiral Stephen Thomas |
 Brian DonlevyLieut. Cmdr. Martin Roberts | Lieut. Cmdr. Martin Roberts |
 Walter BrennanChief Yeoman Henry Johnson | Chief Yeoman Henry Johnson |
 Chill WillsMate Jenks, Chef-Bootsmann | Mate Jenks, Chef-Bootsmann |
 Marilyn MaxwellAudrey Carr | Audrey Carr |
 Henry O'NeillCmdr. Stone M.C | Cmdr. Stone M.C |
 Marta LindenMary Collins | Mary Collins |
 Douglass DumbrilleCapt. Ludlow | Capt. Ludlow |
 Richard QuineEnsign Lindsay | Ensign Lindsay |
 William TannenFlag Lt. Dudley | Flag Lt. Dudley |
 Douglas FowleyEnsign Martin | Ensign Martin |
 Tim RyanLt. Tim Ryan | Lt. Tim Ryan |
 Dick SimmonsLt. (jg) Royce | Lt. (jg) Royce |
 Byron FoulgerPharmacist's Mate 'Doc' Miller | Pharmacist's Mate 'Doc' Miller |
 Hobart CavanaughCarpenter's Mate 'Chips' | Carpenter's Mate 'Chips' |
 Inez CooperSusan Garrison | Susan Garrison |
 Ben WeldenChief Quartermaster Rankin | Chief Quartermaster Rankin |
| HHarry FleischmannChief Signalman | Chief Signalman |
 Douglas WoodSen. Masterman (uncredited) | Sen. Masterman (uncredited) |
 Spec O'DonnellJason (uncredited) | Jason (uncredited) |
 Theodore von EltzCommander (uncredited) | Commander (uncredited) |
 Elizabeth RussellExpectant Mother (uncredited) | Expectant Mother (uncredited) |
 Hal Le SueurLookout (uncredited) | Lookout (uncredited) |
 Robert KentHank Nels (uncredited) | Hank Nels (uncredited) |
| SSam HarrisSenator at Party (uncredited) | Senator at Party (uncredited) |
| WWilliam RobertsMarine Messenger (uncredited) | Marine Messenger (uncredited) |
 Frank McLureShip Officer (uncredited) | Ship Officer (uncredited) |
 Jim DavisTalker (uncredited) | Talker (uncredited) |
 Wally CassellTalker (uncredited) | Talker (uncredited) |
