Seiichi Tagawa (田川 誠一, Tagawa Seiichi, June 4, 1918 – August 7, 2009) was a Japanese politician who co-founded the now defunct New Liberal Club in 1976, and served as its president from 1979 until 1984. Tagawa graduated from Keio University with a B.L. in December 1941. After that, he worked in the Imperial Japanese Army and The Asahi Shimbun Company. Tagawa was first elected to the House of Representatives of Japan in 1960. He would ultimately be re-elected to the House in eleven elections.