| Name | Class | Country | Year of Launch |
| I-14 | Type AM-class Submarine | Japan | 1944 |
| I-369 | Type D1-class Submarine | Japan | 1944 |
| I-400 | I-400-class Submarine | Japan | |
| I-401 | I-400-class Submarine | Japan | |
| I-402 | I-400-class Submarine | Japan | |
| I-52 | C3-class Submarine | Japan | |
| I-53 | C3-class Submarine | Japan | |
| I-58 | Type B3-class Submarine | Japan | 1943 |
| I-58/I-158 | Kaidai-class Submarine | Japan | 1925 |
| I-68/I-168 | Kaidai-class Submarine | Japan | 1933 |
| Ibuki | Ibuki-class Light Carrier | Japan | 1943 |
| Icefish | Balao-class Submarine | United States | |
| Ikazuchi | Akatsuki-class Destroyer | Japan | 1932 |
| Illinois | Iowa-class Battleship | United States | |
| Illustrious | Illustrious-class Aircraft Carrier | United Kingdom | 1939 |
| Ilmarinen | Väinämöinen-class Coastal Defense Ship | Finland | 1931 |
| Iltis | 1924-class Motor Torpedo Boat | Germany | 1927 |
| Impero | Vittorio Veneto-class Battleship | Italy | 1939 |
| Independence | Independence-class Light Carrier | United States | 1942 |
| Indiana | South Dakota-class Battleship | United States | 1941 |
| Indianapolis | Portland-class Heavy Cruiser | United States | 1931 |
| Indomitable | Illustrious-class Aircraft Carrier | United Kingdom | 1940 |
| Intrepid | Essex-class Aircraft Carrier | United States | 1943 |
| Iowa | Iowa-class Battleship | United States | 1942 |
| Irako | No Classification | Japan | 1941 |
| Iride | Perla-class Submarine | Italy | 1936 |
| Irwin | Fletcher-class Destroyer | United States | 1943 |
| Isaac Sweers | Gerard Callenburgh-class Destroyer | Netherlands | 1940 |
| Ise | Ise-class Battleship | Japan | 1916 |
| Isherwood | Fletcher-class Destroyer | United States | 1942 |
| Isuzu | Nagara-class Light Cruiser | Japan | 1921 |
| Itsukushima | No Classification | Japan | 1929 |
| Iwate | Izumo-class Armored Cruiser | Japan | 1900 |
| Izumo | Izumo-class Armored Cruiser | Japan | 1898 |
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Famous WW2 Quote
"Among the men who fought on Iwo Jima, uncommon valor was a common virtue."Fleet Admiral Chester W. Nimitz, 16 Mar 1945
