Yaichi Tanigawa (谷川 弥一, Tanigawa Yaichi, born 12 August 1941) is a Japanese politician serving in the House of Representatives since 2003.

Yaichi Tanigawa was born 12 August 1941 in the city of Gotō, and is a graduate of Nagasaki Higashi High School. He served in the Nagasaki Prefecture assembly from 1999 to 2003, and founded Tanigawa Kensetsu Co., later serving as chairman of both the corporation and the assembly.^[1]

Tanigawa was first elected as a member of the House of Representatives from the Liberal Democratic Party in the 2003 Japanese general election, replacing Kazuo Torashima as representative from Nagasaki 3rd district. He narrowly defeated Democratic Party of Japan candidate Masahiko Yamada, who was elected in the Kyushu proportional representation block.^[2] Tanigawa was re-elected against Yamada in 2005^[3] before losing his seat to Yamada in 2009.^[4] This time, Tanigawa was elected to the Kyushu PR block. He was later re-elected to Nagasaki 3rd district.

Prior to his resignation from the LDP during the 2023–2024 Japanese slush fund scandal, Tanigawa was a member of the Seiwa Seisaku Kenkyūkai, closely associated with Prime Minister Shinzo Abe.^[5]