Makoto Koga (古賀 誠 Koga Makoto, born August 5, 1940) is a Japanese politician of the Liberal Democratic Party, a member of the House of Representatives in the Diet (national legislature). A native of Setaka, Fukuoka and graduate of Nihon University, he was elected for the first time in 1980 after an unsuccessful run in 1979.
The character Tetsuya Gamon in the manga Akumetsu is based on him.