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Yoriyasu Arima (有馬 頼寧, Arima Yoriyasu, 17 December 1884 – 9 January 1957) was a Japanese politician before and during World War II. His wife was the daughter of Prince Takeda Tsunehisa.
He read Karl Marx and Max Stirner, and other radical philosophers, and became attracted to the agrarian movement and radical political ideas. Arima founded the Nihon Nomin Kumiai (Japan Farmer's Union) together with Kagawa Toyohiko. He was active in various social programmes, including the establishment and support of night school, women's education, farmer's rights, and the rights of the burakumin, and was chairman of a cultural association aimed at improving education and cultural awareness in rural areas.
In 1936, Arima helped organize the Tokyo Senatorsbaseball team, and built a baseball stadium located where the present Korakuen Stadium in Tokyo is now located. Despite pressure from the Japanese military to ban the "western sport" Arima helped sustain it during the war years, and later helped to revive professional baseball in Japan in the postwar period.
In 1940, Arima became head of the Taisei Yokusankai organization, but resigned after five months due to opposition from the militarist faction in the government.
