| Name | Class | Country | Year of Launch |
| S-18 | S-class Submarine | United States | 1920 |
| S-23 | S-class Submarine | United States | 1920 |
| S-25/Jastrzab | S-class Submarine | Poland | 1922 |
| S-26 | S-class Submarine | United States | |
| S-27 | S-class Submarine | United States | 1922 |
| S-28 | S-class Submarine | United States | 1922 |
| S-29/P556 | S-class Submarine | United Kingdom | 1922 |
| S-30 | S-class Submarine | United States | 1918 |
| S-31 | S-class Submarine | United States | 1918 |
| S-32 | S-class Submarine | United States | 1919 |
| S-33 | S-class Submarine | United States | 1918 |
| S-34 | S-class Submarine | United States | 1919 |
| S-35 | S-class Submarine | United States | 1919 |
| S-36 | S-class Submarine | United States | 1919 |
| S-37 | S-class Submarine | United States | 1919 |
| S-38 | S-class Submarine | United States | 1919 |
| S-39 | S-class Submarine | United States | 1919 |
| S-40 | S-class Submarine | United States | 1921 |
| S-41 | S-class Submarine | United States | 1921 |
| S-42 | S-class Submarine | United States | |
| S-43 | S-class Submarine | United States | 1923 |
| S-44 | S-class Submarine | United States | 1923 |
| S-45 | S-class Submarine | United States | 1923 |
| S-46 | S-class Submarine | United States | 1923 |
| S-47 | S-class Submarine | United States | |
| S-7 | Srednyaya-class Submarine | Russia | 1937 |
| Saar | Saar-class Submarine Tender | Germany | 1934 |
| Sable | No Classification | United States | 1923 |
| Saginaw Bay | Casablanca-class Escort Carrier | United States | |
| Sailfish | Sargo-class Submarine | United States | |
| Saint Paul | Baltimore-class Heavy Cruiser | United States | 1944 |
| Sakawa | Agano-class Light Cruiser | Japan | 1944 |
| Salmon | Salmon-class Submarine | United States | 1937 |
| Salt Lake City | Pensacola-class Heavy Cruiser | United States | 1929 |
| San Diego | Atlanta-class Light Cruiser | United States | 1941 |
| San Francisco | New Orleans-class Heavy Cruiser | United States | |
| San Jacinto | Independence-class Light Carrier | United States | 1943 |
| San Juan | Atlanta-class Light Cruiser | United States | 1941 |
| Sanborn | Haskell-class Attack Transport | United States | 1944 |
| Sand Lance | Balao-class Submarine | United States | |
| Saratoga | Lexington-class Aircraft Carrier | United States | 1925 |
| Sargent Bay | Casablanca-class Escort Carrier | United States | 1944 |
| Sargo | Sargo-class Submarine | United States | 1938 |
| Saufley | Fletcher-class Destroyer | United States | 1942 |
| Saury | Sargo-class Submarine | United States | 1938 |
| Savo Island | Casablanca-class Escort Carrier | United States | 1943 |
| Sawfish | Gato-class Submarine | United States | 1942 |
| Scabbardfish | Balao-class Submarine | United States | |
| Scamp | Gato-class Submarine | United States | |
| Scharnhorst | Gneisenau-class Battlecruiser | Germany | 1936 |
| Schlesien | Deutschland-class Battleship | Germany | 1906 |
| Schleswig-Holstein | Deutschland-class Battleship | Germany | 1906 |
| Schnellboot-class Summary Information | Schnellboot-class Motor Torpedo Boat | Germany | |
| Schwabenland | No Classification | Germany | 1925 |
| Scirè | Adua-class Submarine | Italy | 1938 |
| Scorpion | Gato-class Submarine | United States | 1942 |
| Sculpin | Sargo-class Submarine | United States | |
| Sea Cat | Balao-class Submarine | United States | 1944 |
| Sea Devil | Balao-class Submarine | United States | |
| Sea Dog | Balao-class Submarine | United States | |
| Sea Fox | Balao-class Submarine | United States | |
| Sea Owl | Balao-class Submarine | United States | |
| Sea Poacher | Balao-class Submarine | United States | |
| Sea Robin | Balao-class Submarine | United States | 1944 |
| Seadragon | Sargo-class Submarine | United States | |
| Seahorse | Balao-class Submarine | United States | 1943 |
| Seal | Salmon-class Submarine | United States | 1937 |
| Sealion (Balao-class) | Balao-class Submarine | United States | |
| Sealion (Sargo-class) | Sargo-class Submarine | United States | 1939 |
| Searaven | Sargo-class Submarine | United States | 1939 |
| Seawolf | Sargo-class Submarine | United States | |
| Seeadler | 1923-class Motor Torpedo Boat | Germany | 1926 |
| Segundo | Balao-class Submarine | United States | 1944 |
| Seisho Maru | No Classification | Japan | 1918 |
| Sendai | Sendai-class Light Cruiser | Japan | 1923 |
| Sennet | Balao-class Submarine | United States | 1944 |
| Settsu | Kawachi-class Battleship | Japan | 1911 |
| Seydlitz | Admiral Hipper-class Heavy Cruiser | Germany | 1939 |
| Shad | Gato-class Submarine | United States | 1942 |
| Shamrock Bay | Casablanca-class Escort Carrier | United States | 1944 |
| Shangri-La | Essex-class Aircraft Carrier | United States | 1944 |
| Shark (Balao-class) | Balao-class Submarine | United States | 1943 |
| Shark (Porpoise-class) | Porpoise-class Submarine | United States | 1935 |
| Shaw | Mahan-class Destroyer | United States | 1935 |
| ShCh-205 | Shchuka-class Submarine | Russia | 1934 |
| ShCh-307 | Shchuka-class Submarine | Russia | 1934 |
| ShCh-317 | Shchuka-class Submarine | Russia | 1935 |
| ShCh-320 | Shchuka-class Submarine | Russia | 1935 |
| ShCh-324 | Shchuka-class Submarine | Russia | 1935 |
| ShCh-401 | Shchuka-class Submarine | Russia | 1935 |
| Shigure | Shiratsuyu-class Destroyer | Japan | 1936 |
| Shimakaze | Shimakaze-class Destroyer | Japan | 1942 |
| Shinano | Shinano-class Aircraft Carrier | Japan | 1944 |
| Shinyo | Shinyo-class Escort Carrier | Japan | |
| Shinyo Maru | No Classification | Japan | |
| Shinyo-class Summary Information | Shinyo-class Motor Torpedo Boat | Japan | |
| Shoho | Zuiho-class Light Carrier | Japan | 1935 |
| Shokaku | Shokaku-class Aircraft Carrier | Japan | 1939 |
| Siluro a Lenta Corsa-class Summary Information | Siluro a Lenta Corsa-class Midget Submarine | Italy | |
| Silversides | Gato-class Submarine | United States | 1941 |
| Sims | Sims-class Destroyer | United States | 1939 |
| Skate | Balao-class Submarine | United States | |
| Skipjack | Salmon-class Submarine | United States | 1937 |
| Smalley | Fletcher-class Destroyer | United States | 1943 |
| Snapper | Salmon-class Submarine | United States | |
| Snook | Gato-class Submarine | United States | 1942 |
| Sokrushitelnyi | Gnevny-class Destroyer | Russia | 1936 |
| Soryu | Soryu-class Aircraft Carrier | Japan | 1935 |
| South Dakota | South Dakota-class Battleship | United States | 1941 |
| Soya | No Classification | Japan | 1937 |
| SP1 | Spähkreuzer 1938-class Scout Cruiser | Germany | |
| SP10 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1944 (Projected, not actual) |
| SP11 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1944 (Projected, not actual) |
| SP12 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1944 (Projected, not actual) |
| SP13 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1945 (Projected, not actual) |
| SP14 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1945 (Projected, not actual) |
| SP15 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1945 (Projected, not actual) |
| SP16 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP17 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP18 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP19 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP2 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1942 (Projected, not actual) |
| SP20 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP21 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP22 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1946 (Projected, not actual) |
| SP3 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1944 (Projected, not actual) |
| SP4 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1943 (Projected, not actual) |
| SP5 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1943 (Projected, not actual) |
| SP6 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1943 (Projected, not actual) |
| SP7 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1943 (Projected, not actual) |
| SP8 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1944 (Projected, not actual) |
| SP9 (Planned) | Spähkreuzer 1938-class Scout Cruiser | Germany | 1943 (Projected, not actual) |
| Spadefish | Balao-class Submarine | United States | |
| Spearfish | Sargo-class Submarine | United States | 1938 |
| Spencer | Treasury-class USCG Cutter | United States | 1937 |
| Spikefish | Balao-class Submarine | United States | |
| Spot | Balao-class Submarine | United States | 1944 |
| Springer | Balao-class Submarine | United States | 1944 |
| Sproston | Fletcher-class Destroyer | United States | 1942 |
| Squalo | Squalo-class Submarine | Italy | |
| St. Louis | St. Louis-class Light Cruiser | United States | 1938 |
| Steamer Bay | Casablanca-class Escort Carrier | United States | 1944 |
| Steelhead | Gato-class Submarine | United States | |
| Stephen Hopkins | Liberty-class Merchant Vessel | United States | 1942 |
| Sterlet | Balao-class Submarine | United States | 1943 |
| Stewart | Clemson-class Destroyer | United States | 1920 |
| Stickleback | Balao-class Submarine | United States | |
| Stier | No Classification | Germany | 1936 |
| Stingray | Salmon-class Submarine | United States | |
| Stord | S-class Destroyer | Norway | 1943 |
| Strasbourg | Dunkerque-class Battleship | France | 1936 |
| Stuart | Scott-class Destroyer | Australia | 1918 |
| Sturgeon | Salmon-class Submarine | United States | |
| Suffren | Suffren-class Heavy Cruiser | France | 1927 |
| Sunfish (Gato-class) | Gato-class Submarine | United States | 1942 |
| Sunfish (S-class) | S-class Submarine | United Kingdom | 1936 |
| Suzukaze | Shiratsuyu-class Destroyer | Japan | |
| Suzuya | Mogami-class Heavy Cruiser | Japan | 1934 |
| Swordfish | Sargo-class Submarine | United States | |
| Sydney | Leander-class Light Cruiser | Australia | 1934 |
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