Satsuma (薩摩) 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 1922–1924 in accordance with the terms of the Washington Naval Treaty of 1922.

Mutsu (陸奥) was the second and last Nagato-class dreadnought battleship built for the Imperial Japanese Navy (IJN) at the end of World War I. She was named after the province. In 1923 she carried supplies for the survivors of the Great Kantō earthquake. The ship was modernized in 1934–1936 with improvements to her armour and machinery, and a rebuilt superstructure in the pagoda mast style.