Sadatarō Hiraoka (Japanese: 平岡定太郎) (July 19, 1863 – August 26, 1942) was the third Director of Karafuto Prefecture (11 June 1908 – 3 June 1914)., also the 17th governor of Fukushima Prefecture (1906–1908). He was from Harima Province, and was a graduate of the University of Tokyo. Yukio Mishima was his grandchild.
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