Issei Koga (古賀 一成, Koga Issei, born July 30, 1947) is a retired Japanese politician of the Democratic Party of Japan, who served as a member of the House of Representatives in the Diet (national legislature).

A native of Yanagawa, Fukuoka and graduate of the University of Tokyo, he was a bureaucrat at the Ministry of Construction from 1971 to 1988.

He was elected to the House of Representatives for the first time in 1990.

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