Haruko Arimura (有村 治子, Arimura Haruko, born 21 September 1970) is a Japanese politician of the Liberal Democratic Party (LDP), a member of the House of Councillors in the Diet of Japan. She is a descendant of , the ringleader of the Sakuradamon Incident, and Togo Heihachiro, the admiral of the Russo-Japanese War.