Shunichi Mizuoka (水岡 俊一, Mizuoka Shun'ichi, born June 13, 1956) is a Japanese politician of the Democratic Party of Japan, a former member of the House of Councillors in the Diet (national legislature). A native of Takeno, Hyogo and graduate of Nara University of Education, he was elected to represent the Hyogo at-large district in 2004 and was re-elected in 2010. He lost his seat in 2016.