Date of Birth: 
Place of Birth: Tosa Province, Japan
About Ōishi Masami
- Oishi Masami (?? ??, 26 May 1855 – 12 July 1935) was a politician and cabinet minister in the pre-war Empire of Japan. Oishi was a native of Tosa Province (modern-day Kochi Prefecture), where his father was a samurai in the service of Tosa Domain.
- In 1873, he joined with Itagaki Taisuke and became an important member of the Freedom and People's Rights Movement.
- He became one of the leaders of the Jiyuto political party in 1881.
- However, he had a falling out with Itagaki in 1882 and left the party.
- He subsequently joined with Goto Shojiro’s daido danketsu (coalition) movement in 1887.
- In 1892, he was appointed to the Japanese legation in Seoul, Korea.
- He was back in Japan by 1896, and was one of the founding members of the Shimpoto political party.
- Under the short-lived 1st Okuma Shigenobu administration in 1898, Oishi was appointed Minister of Agriculture and Commerce. Oishi later joined the Rikken Kokuminto and was at one point a contender against Inukai Tsuyoshi for its leadership.
- In 1913, he broke with Inukai, and joined Katsura Taro’s new Rikken Doshikai, where he was ranked as one of its five leaders.
- He retired from politics in 1915, after having been elected to the Lower House of the Diet of Japan for six terms.
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