Kōtarō Tatsumi

is a Japanese politician who serves in the House of Representatives for Kinki PR as a member of the Japanese Communist Party. Tatsumi was in the House of Councillors for Osaka from 2013 to 2019. He was a candidate in the 2023 Osaka gubernatorial election.

Biography Tatsumi was born on 21 August 1976,

In 2003, Tatsumi ran for a seat in the Osaka Prefectural Assembly but lost. He also unsuccessfully ran for the same position in the 2007 and 2011 elections. He run for re-election in 2019 but was defeated by candidates from Ishin no Kai and Liberal Democratic Party (LDP) receiving approximately 380,000 votes. Following an unsuccessful run for the same seat in 2022, he ran for the 2023 Osaka gubernatorial election as an independent. He was endorsed for this by JCP but defeated by incumbent Hirofumi Yoshimura.

Tatsumi was elected as a member of the House of Representatives for Kinki proportional representation block for the JCP in the 2024 Japanese general election. He was again reelected to the same seat in 2026. He is a member of the House of Representatives' Health, Labour and Welfare Committee, Budget Committee, and Special Committee on Reconstruction and Nuclear Power.

Personal life Tatsumi was married and had one daughter and two sons. He is also against the amendment of the Article 9 of the Japanese Constitution, including the strengthening of the Japan Self-Defense Forces. He is somewhat against the strengthening of United States–Japan relations, supported strengthening of Japan–South Korea relations, but remains neutral on strengthening of China-Japan relations.

Tatsumi supported the abolition of nuclear power in Japan. He also supported same-sex marriage and allowing female emperors, but is against the return of the former imperial family member who left the imperial family after the war.