Shinya Adachi (足立 信也, Adachi Shin'ya, born June 5, 1957) is a Japanese politician of the Democratic Party for the People, and a former member of the House of Councillors in the Diet (national legislature).

A native of Ōita, Ōita, he attended University of Tsukuba and received a Ph.D. in medicine from it.

He served until 2022, and in 2023 he became the mayor of Ōita city.

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