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| Japan Maritime Self-Defense Force | |
| Aliases: | JMSDF |
| Continuity: | Real world |
| Type: | Military personnel |
| Status: | Active |
| Allies: | Japan Air Self-Defense Force Japan Ground Self-Defense Force |
| Enemies: | Godzilla |
The Japan Maritime Self-Defense Force (海上自衛隊), or JMSDF, is the naval branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. It was formed following the dissolution of the Imperial Japanese Navy (IJN) after World War II. The JMSDF has a large fleet and its main tasks are to maintain control of the nation's sea lanes and to patrol territorial waters. It has also stepped up its participation in UN-led peacekeeping operations (PKOs) and Maritime Interdiction Operations (MIOs).