Isoroku Yamamoto (撅望?? 鈭???Yamamoto Isoroku, April 4, 1884 ??April 18, 1943) was a Japanese Marshal Admiral and the commander-in-chief of the Combined Fleet during World War II, a graduate of the Imperial Japanese Naval Academy.

Yamamoto held several important posts in the Imperial Japanese Navy, and undertook many of its changes and reorganizations, especially its development of naval aviation. He was the commander-in-chief during the decisive early years of the Pacific War and so was responsible for major battles such as Pearl Harbor and Midway.

He died when American codebreakers identified his flight plans and his plane was shot down. His death was a major blow to Japanese military morale during World War II.