Tetsuya Yagi

is a Japanese politician of the Liberal Democratic Party, who served as a member of the House of Representatives.

Early years Yagi was born in Takahashi, Nishikamo District, Aichi Prefecture. His father was a member of the Toyota City Council.

Yagi graduated from Chuo University's Faculty of Science and Engineering in 1972 and then lived a wandering life in various parts of India.

In 1974, Yagi joined Kojima Industries Corporation, where he worked until 1998.

In the 2014 general election, Yagi lost to DPJ's Furumoto and won a seat in Tōkai PR.

In the 2017 general election, Yagi lost to Kibō’s Furumoto and won a seat in Tōkai PR.

In 2019, Yagi was appointed to Parliamentary Vice-Minister for the Environment in the Fourth Abe Second reshuffled cabinet.

In the 2020 LDP presidential election, Yagi endorsed Shigeru Ishiba as a recommender.

On 17 October 2020, Yagi announced his retirement at a meeting with supporters. However, on 30 May 2021, Yagi withdrew his retirement and announced his candidacy for the next general election because he could not find a successor.

In the 2021 general election, Furumoto announced his retirement at the request of the Toyota Workers' Union, which supported him that had been competing for Aichi 11th's seat with Yagi. Yagi defeated JCP candidate and gain Aichi 11th's seat for the first time.

In 2023, Yagi was appointed to State Minister of Environment in the Second Kishida Second reshuffled cabinet.

In the 2024 LDP presidential election, Yagi endorsed Ishiba as a recommender again. After Ishiba was elected to the PM, he was re-appointed to State Minister of Environment in the First Ishiba cabinet.

In the 2024 general election, Yagi lost to DPP's Midori Tanno and lost re-election.