was a semi-dreadnought battleship built for the Imperial Japanese Navy (IJN) in the first decade of the 20th Century. Lead ship of her class, she was the first battleship built in Japan. She was named for Satsuma Province, now a part of Kagoshima prefecture. The ship saw no combat during World War I, although she led a squadron that occupied several German colonies in the Pacific Ocean in 1914. Satsuma was disarmed and sunk as a target in 1922–24 in accordance with the terms of the Washington Naval Treaty of 1922.