Sadatarō Hiraoka (; 19 July 1863 – 26 August 1942)was the third Director of Karafuto Prefecture (11 June 1908 – 3 June 1914), and the 17th governor of Fukushima Prefecture (1906–1908). He was from Harima Province, and was a graduate of Tokyo Imperial University. Yukio Mishima was his grandchild.
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External links 平岡定太郎の墓 福島県知事、平岡定太郎の経歴について知りたい - リファレンス共同データベース