Hiroshi Nakai (中井 洽 Nakai Hiroshi?, born 10 June 1942) is a Japanese politician serving in the House of Representatives in the Diet (national legislature) as a member of the Democratic Party of Japan. He was born in Jilin, China on 10 June 1942, in a part of China occupied by Japan called Manchukuo. A graduate of Keio University he was elected for the first time in 1976 after an unsuccessful run in 1972.
Nakai is affiliated to the openly revisionist lobby Nippon Kaigi.