Viscount Masataka Kawase (?? ??, Kawase Masataka, March 12, 1840 – September 29, 1919), a.k.a.
Kogoro Ishikawa (?? ???, Ishikawa Kogoro) was a Japanese Shishi, and later, a diplomat.
He attended a battle in the 1860s at Choshu Domain.
Especially, in 1865, he was the commander in Kozan-ji uprising, as Hirobumi Ito, under Shinsaku Takasugi.
He also served at the Second Choshu expedition, and led the Choshu Army to win.
In the 1870s served as Japanese Minister to Rome.
In 1876 concluded successfully negotiations with Italian sculptor Vincenzo Ragusa to take a teaching position at the newly opened government sponsored art school in Tokyo.
Served as Japanese Consul in London in 1884-1893.
In 1894, Kawase became a member of the Privy Council till his death.