Kiyoshi Yabuuchi (Yabuuchi Kiyoshi 薮内 清; 12 February 1906 (Meiji 39) – 2 June 2000 (Heisei 12)), often written in Kunrei-shiki romanization as Kiyosi Yabuuti, was a Japanese astronomer and historian of science. He gained an international reputation as a leading pioneer in the field of pre-1840 Chinese mathematics and Chinese astronomy.[1]