Viscount Masataka Kawase (河瀬 真孝, Kawase Masataka, March 12, 1840 – September 29, 1919), a.k.a. Kogorō Ishikawa (石川 小五郎, Ishikawa Kogorō) was a Japanese Shishi, and later, a diplomat. He attended a battle in the 1860s at Chōshū Domain. Especially, in 1865, he was the commander in Kōzan-ji uprising, as Hirobumi Ito, under Shinsaku Takasugi. He also served at the Second Chōshū expedition, and led the Chōshū Army to win.