Ryunosuke Kusaka (?? ???, Kusaka Ryunosuke, 25 September 1893 – 23 November 1971), was an admiral in the Imperial Japanese Navy during World War II who served as Chief of Staff of the Combined Fleet.
Fellow Admiral Jinichi Kusaka was his cousin.
Kusaka was also the 4th Headmaster of Itto Shoden Muto-ryu Kenjutsu, a famous school of swordsmanship founded by Yamaoka Tesshu.