Nanjung ilgi (Korean: 난중일기; Hanja: 亂中日記) or the War Diary of Yi Sun-sin is the personal diary of Admiral Yi Sun-sin, a Korean admiral famed for his victories against the Japanese navy during the Imjin war during the Joseon period.

It was written between January 1, 1592, and November 17, 1598, a first person narrative of the admiral's perspective on the Japanese invasions of Korea in the late 16th century.

It is the 76th national treasure of Korea and listed in UNESCO's Memory of the World registry.

[3] There is also some overlap between Volumes 5 and 6, where Admiral Yi apparently later revised earlier entries.

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