Koichi Yamamoto (山本 公一 Yamamoto Kōichi, born September 4, 1947) is a Japanese politician of the Liberal Democratic Party, a member of the House of Representatives in the Diet (national legislature). A native of Uwajima, Ehime and graduate of Keio University, he was elected to his one term in the assembly of Aichi Prefecture in 1991 and to the House of Representatives for the first time in 1993.