- Humphrey Bogart
- Lt. Joe Rossi
- Raymond Massey
- Capt. Steve Jarvis
- Alan Hale
- Boats O'Hara
- Julie Bishop
- Pearl O'Neill
- Ruth Gordon
- Mrs. Sarah Jarvis
- Sam Levene
- Abel 'Chips' Abrams
- Dane Clark
- Johnnie Pulaski
- Peter Whitney
- Whitey Lara
- Dick Hogan
- Cadet Ezra Parker
- Virginia Christine
- Pebbles
- Ray Montgomery
- Aherne
- Louis Adlon
- German Ensign
- Iris Adrian
- Jenny O'Hara
- Frank Alten
- German
- Kirk Alyn
- Brazilian Gun Captain
- C.E. Anderson
- Bearded Lieutenant Commander
- Tod Andrews
- Ahearn
- Louis V. Arco
- Submarine Commander
- Warren Ashe
- U.S. Sailor
- Hooper Atchley
- Lieutenant-Commander
- Irving Bacon
- Bartender
- Leah Baird
- Mother
- Joseph E. Bernard
- Ed
- Monte Blue
- Seaman
- Stanley Blystone
- U.S. Commander
- Sven Hugo Borg
- Norwegian Seaman
- Chick Chandler
- Goldberg
- Eddy Chandler
- Seaman
- Alex Chivra
- Lieutenant-Commander at Meeting
- Eddie Coke
- Signal Man
- Alec Craig
- McGonigle
- Hal Craig
- Ship Officer
- Albert D'Arno
- German Sailor
- George Davis
- German Sailor
- Jean Del Val
- Capt. La Pricor
- Janna DeLoos
- Murmansk Welcomer
- Eddie Dew
- Lieutenant-Commander at Meeting
- Donald Douglas
- Lieutenant-Commander
- Warren Douglas
- Navy Pilot
- Arthur Dulac
- French Seaman
- Johnny Duncan
- Sailor
- Ralph Dunn
- Quartermaster
- Carl Ekberg
- Dutch Seaman
- John Epper
- German Lieutenant-Commander
- James Flavin
- Merchant Marine School Lieutenant-Commander
- Charles Flynn
- German
- Ross Ford
- Ensign Speaker
- William Forrest
- Lieutenant-Commander
- Art Foster
- Pete Larson
- Eddie Foster
- American Seaman
- Arno Frey
- German Pilot
- Hans Fuerberg
- German Officer
- Frederick Giermann
- German Submarine Captain
- Art Gilmore
- President Franklin D. Roosevelt
- Christine Gordon
- Murmansk Welcomer
- Kit Guard
- Unemployed Seaman
- Henry Guttman
- Nazi Submarine Officer
- William Haade
- Loudmouth Saloon Patron
- Creighton Hale
- Sparks
- Eddie Hall
- Casino Club Patron at Loudmouth's Table
- Ernst Hauessermann
- German
- Lew Hicks
- Lieutenant-Commander at Meeting
- Stuart Holmes
- Lieutenant-Commander at Meeting
- William Hopper
- Canadian Soldier
- Ted Jacques
- Ship Officer
- Lew Kelly
- Tony Gonzales
- Fred Kelsey
- Joe
- J.M. Kerrigan
- Caviar Jinks
- Victor Kilian Jr.
- U.S. Navy Petty Officer
- George Kirby
- Pilot Johnson
- Kurt Kreuger
- German U-Boat Sailor on Microphone
- Glenn Langan
- Gun Crewman
- Rolf Lindau
- Submarine Radio Operator
- Manuel López
- Mexican Seaman
- Anthony Marsh
- English Gun Captain
- Frank Mayo
- Major / Seaman (uncredited)
- Clyde McAtee
- Lieutenant-Commander at Meeting
- Charles McMurphy
- Lieutenant-Commander at Meeting
- Edwin Mills
- Naval Radio Operator
- Frank Mills
- Seaman
- Howard M. Mitchell
- Undetermined Secondary Role
- Dennis Moore
- Signalman
- Jack Mower
- Dispatcher
- Rudolf Myzet
- Russian Seaman
- George N. Neise
- German Lieutenant
- Kurt Neumann
- German
- William H. O'Brien
- Lieutenant-Commander at Meeting
- Bob O'Connor
- Lieutenant-Commander at Meeting
- Gene O'Donnell
- Lieutenant-Commander
- George O'Hanlon
- Navy Pilot
- George Offerman Jr.
- Cecil
- Paul Panzer
- Seaman
- Lee Phelps
- Lieutenant-Commander
- Joe Ploski
- German Sailor
- Russ Powell
- Slops Denton
- Hugh Prosser
- Lieutenant Commander
- Frank Puglia
- Capt. Carpolis
- Pedro Regas
- Greek Seaman
- Otto Reichow
- German Petty Officer
- Grandon Rhodes
- Lieutenant Commander
- Vera Richkova
- Murmansk Welcomer
- Kane Richmond
- Ensign Wright
- Walter Rode
- Russian Air Force Captain
- Cliff Saum
- Seaman
- Syd Saylor
- Jim
- Ferdinand Schumann-Heink
- German
- Hans Schumm
- Lieutenant Commander
- Harry Seymour
- Pianist
- George Sherwood
- German
- Walter Soderling
- Pop
- George Sorel
- German Bombardier
- Glenn Strange
- Jake
- Ludwig Stössel
- Capt. Ziemer
- Leo Sulky
- Unemployed Seaman
- Charles Sullivan
- Seaman
- Elliott Sullivan
- Hennessy
- Walter Thiele
- German
- Sigfrid Tor
- Helmsman
- Charles Trowbridge
- Rear Adm. Hartridge
- Peter van Eyck
- German Ensign
- Roland Varno
- Gunnery Captain
- Wilhelm von Brincken
- German Submarine Captain
- Hans von Morhart
- German
- Minor Watson
- Rear Adm. Williams
- Dick Wessel
- Cherub Joe
- John Whitney
- U.S. Sailor
- Dave Willock
- Convoy Speaker
- Tom Wilson
- Bar Patron
- Eric Wilton
- Lieutenant-Commander at Meeting
- Al Winters
- German Lieutenant
- Jack Wise
- Dispatcher
- Richard Woodruff
- Squadron Leader
- Jack Young
- President Franklin D. Roosevelt
