| Order: | 5th |
| Office: | Governor of Hokkaidō |
| Term Start: | 9 April 1995 |
| Term End: | April 2003 |
| Predecessor: | Takahiro Yokomichi |
| Successor: | Harumi Takahashi |
| Birth Date: | 22 November 1935 |
| Birth Place: | Tomakishi, Karafuto |
| Nationality: | Japanese |
| Party: | Independent |
| Alma Mater: | Tokyo University of Agriculture |
| Occupation: | administrator, politician, lecturer |
is a Japanese politician. He was director of the Hokkaidō-Kitami University. From 1995 he served as governor of Hokkaidō for two terms totalling 8 years. He was chairman of the board of Sapporo University. He was associate professor at Tokyo University of Agriculture.
Tatsuya Hori originally comes from Tomakishi, Karafuto (Vakhrushev, Sakhalin). He was raised in Engaru, Hokkaidō in Abashiri Subprefecture. In 1958 he graduated from Hokkaidō University Department of Agriculture and entered service in the Hokkaidō government.
Under Governor Takahiro Yokomichi, he was assistant director of the Public Works Department, room monitor for the governor, and municipal utility administrator. He served as lieutenant governor. In 1995 he ran and won election to the office of governor as an independent with the support of the New Frontier Party, the Japan Socialist Party, the Democratic Socialist Party, and the Justice Party. He was reelected to a second term with the support of the Liberal Democratic Party, the Democratic Party, the Justice Party, the Social Democratic Party, and the Democratic Socialist Party.
In 1997, after the bankruptcy of the Hokkaidō Colonization Bank, he declared a state of emergency and called for a restructuring of Hokkaidō, but public utilities expenses deteriorated for which he will always be remembered. He gave up running for a third term. After stepping down as governor, he assumed the office of board chairman of Sapporo University in August 2008.[1]