Kōichi Watanabe

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

Early years In 1957, Watanabe was born in Kita ward, Tokyo. He graduated from the Health Sciences University of Hokkaido.

After graduating from university, he worked as an associate at a dental clinic before opening his own practice in Iwamizawa in 1991. In 1996, he was appointed President of the Iwamizawa Junior Chamber, and he has also served as the Chairperson of both the Iwamizawa PTA Federation and the Sorachi PTA Federation.

In the 2014 general election, Watanabe won a seat in the PR.

In the 2017 general election, Watanabe won a seat in the PR.

In September 2019, Watanabe was appointed to the Parliamentary Secretary for Defense and the Parliamentary Vice-Minister of Cabinet Office in the Fourth Abe second reshuffled cabinet.

In October 2021, Watanabe was appointed to the Parliamentary Vice-Minister for Internal Affairs and Communications in the First Kishida cabinet.

In the 2021 general election, Watanabe won a seat in the PR. After the election, he was re-appointed to the Parliamentary Vice-Minister for Internal Affairs and Communications in the Second Kishida cabinet.

In September 2023, Watanabe was appointed to the State Minister for Internal Affairs and Communications in the Second Kishida second reshuffled cabinet.

In the 2024 LDP presidential election, Watanabe endorsed Yoshimasa Hayashi as a recommender.

In the 2024 general election, Watanabe lost re-election because he was placed low on the party list.

On 3 May 2025, Watanabe applied for the open recruitment of the head of the LDP's Hokkaido 10th branch and tried to run in Hokkaido 10th. After the Komeito left the coalition, the LDP nominated Watanabe as a Hokkaido 10th candidate.

In the 2026 general election, Watanabe lost to CRA's Hiroshi Kamiya only by 21 votes and won a seat in the PR.

Scandal Allegations of Public Offices Election Act Violations In June 2018, it was reported that the "LDP Hokkaido House of Representatives Proportional Representation 1st Branch," a political organization headed by Watanabe, spent approximately 239,000 yen on a bus tour for supporters. The expenditures included costs for food and beverages, shrimp for souvenirs, and bus rental fees. There were nine participants, each paying a fee of 7,000 yen. While the political funds-expenditure report recorded a total income of 63,000 yen from these fees, the tour resulted in a deficit of approximately 176,000 yen. Following the publication of the report, media outlets pointed out that this discrepancy could potentially violate the Public Offices Election Act, which prohibits donations to voters within an individual's constituency.