| Name | Class | Country | Year of Launch |
| P (Planned) | O-class Battlecruiser | Germany | 1941 (Projected, not actual) |
| P (Planned) | M-class Light Cruiser | Germany | 1943 (Projected, not actual) |
| P (Planned) | M-class Light Cruiser | Germany | 1945 (Projected, not actual) |
| P1 (Planned) | P-class Heavy Cruiser | Germany | 1943 (Projected, not actual) |
| P10 (Planned) | P-class Heavy Cruiser | Germany | 1944 (Projected, not actual) |
| P11 (Planned) | P-class Heavy Cruiser | Germany | 1944 (Projected, not actual) |
| P12 (Planned) | P-class Heavy Cruiser | Germany | 1945 (Projected, not actual) |
| P2 (Planned) | M2-class Light Cruiser | Germany | 1947 (Projected, not actual) |
| P2 (Planned) | P-class Heavy Cruiser | Germany | 1942 (Projected, not actual) |
| P3 (Planned) | P-class Heavy Cruiser | Germany | 1944 (Projected, not actual) |
| P4 (Planned) | P-class Heavy Cruiser | Germany | 1942 (Projected, not actual) |
| P5 (Planned) | P-class Heavy Cruiser | Germany | 1943 (Projected, not actual) |
| P6 (Planned) | P-class Heavy Cruiser | Germany | 1945 (Projected, not actual) |
| P7 (Planned) | P-class Heavy Cruiser | Germany | 1945 (Projected, not actual) |
| P8 (Planned) | P-class Heavy Cruiser | Germany | 1945 (Projected, not actual) |
| P9 (Planned) | P-class Heavy Cruiser | Germany | 1944 (Projected, not actual) |
| Paddle | Gato-class Submarine | United States | |
| Pampanito | Balao-class Submarine | United States | |
| Panay | No Classification | United States | |
| Papanikolis | Katsonis-class Submarine | Greece | |
| Parche | Balao-class Submarine | United States | 1943 |
| Pargo | Gato-class Submarine | United States | |
| Parizhskava Kommuna | Gangut-class Battleship | Russia | 1911 |
| Pasadena | Cleveland-class Light Cruiser | United States | 1943 |
| Pennsylvania | Pennsylvania-class Battleship | United States | 1915 |
| Pensacola | Pensacola-class Heavy Cruiser | United States | 1929 |
| Perch (Balao-class) | Balao-class Submarine | United States | |
| Perch (Porpoise-class) | Porpoise-class Submarine | United States | 1936 |
| Perla | Perla-class Submarine | Italy | |
| Permit | Porpoise-class Submarine | United States | 1936 |
| Perth | Leander-class Light Cruiser | Australia | 1934 |
| Peto | Gato-class Submarine | United States | |
| Petrof Bay | Casablanca-class Escort Carrier | United States | 1944 |
| Philip | Fletcher-class Destroyer | United States | 1942 |
| Phoenix | Brooklyn-class Light Cruiser | United States | 1938 |
| Pickerel | Porpoise-class Submarine | United States | 1936 |
| Picking | Fletcher-class Destroyer | United States | 1943 |
| Picuda | Balao-class Submarine | United States | |
| Pietro Calvi | Calvi-class Submarine | Italy | |
| Pike | Porpoise-class Submarine | United States | |
| Pilotfish | Balao-class Submarine | United States | |
| Pinghai | Ninghai-class Light Cruiser | China | 1935 |
| Pinguin | No Classification | Germany | 1936 |
| Pintado | Balao-class Submarine | United States | 1943 |
| Pipefish | Balao-class Submarine | United States | |
| Piper | Balao-class Submarine | United States | |
| Piranha | Balao-class Submarine | United States | 1943 |
| Plaice | Balao-class Submarine | United States | 1943 |
| Platino | Acciaio-class Submarine | Italy | |
| Plunger | Porpoise-class Submarine | United States | |
| Pogy | Gato-class Submarine | United States | 1942 |
| Pola | Zara-class Heavy Cruiser | Italy | |
| Pollack | Porpoise-class Submarine | United States | 1936 |
| Pomfret | Balao-class Submarine | United States | |
| Pomodon | Tench-class Submarine | United States | |
| Pompano | Porpoise-class Submarine | United States | |
| Pompon | Gato-class Submarine | United States | 1942 |
| Porfido | Acciaio-class Submarine | Italy | |
| Porpoise | Porpoise-class Submarine | United States | |
| Porter | Porter-class Destroyer | United States | 1935 |
| Portland | Portland-class Heavy Cruiser | United States | 1932 |
| Preston (Fletcher-class) | Fletcher-class Destroyer | United States | 1943 |
| Preston (Mahan-class) | Mahan-class Destroyer | United States | 1936 |
| Prichett | Fletcher-class Destroyer | United States | 1943 |
| Primauguet | Duguay-Trouin-class Light Cruiser | France | 1924 |
| Prince of Wales | King George V (1939)-class Battleship | United Kingdom | |
| Princeton | Independence-class Light Carrier | United States | 1942 |
| Pringle | Fletcher-class Destroyer | United States | 1942 |
| Prinz Eugen | Admiral Hipper-class Heavy Cruiser | Germany | 1938 |
| Proteus | Fulton-class Submarine Tender | United States | 1942 |
| Provana | Marcello-class Submarine | Italy | |
| Provence | Bretagne-class Battleship | France | 1913 |
| PT-class Summary Information | PT-class Motor Torpedo Boat | United States | |
| Puffer | Gato-class Submarine | United States | 1942 |
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"Since peace is now beyond hope, we can but fight to the end."Chiang Kaishek, 31 Jul 1937
