Koichi Yamamoto (山本 公一, Yamamoto Kōichi, September 4, 1947 – October 31, 2023) was 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, Yamamoto was the son of Yuichi Yamamoto, the mayor of Uwajima, and a member of the House of Representatives.

Yamamoto 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.

His profile on the LDP website:[1] Koichi Yamamoto died on October 31, 2023, at the age of 76.

[2] Affiliated to the openly revisionist lobby Nippon Kaigi,[3] Yamamoto gave the following answers to the questionnaire submitted by Mainichi to parliamentarians in 2012:[4]