is a Japanese politician.
| Koji Sato | |
| Native Name Lang: | ja |
| Office: | Member of the House of Representatives |
| Term Start: | 22 October 2017 |
| Predecessor: | Shizuka Kamei |
| Constituency: | Hiroshima 6th district |
| Term Start1: | 25 June 2000 |
| Term End1: | 8 August 2005 |
| Constituency1: | Chugoku PR block |
| Office2: | Member of the House of Councillors |
| Term Start2: | 29 July 2007 |
| Term End2: | 28 July 2013 |
| Constituency2: | Hiroshima at-large district |
| Birth Date: | 28 July 1959 |
| Birth Place: | Mukaishima, Mitsugi District, Hiroshima Prefecture, Japan |
| Party: | CDP |
| Otherparty: | New Frontier Liberal Democratic Tomorrow Liberal Kibō no Tō Independent |
| Alma Mater: | Keio University |
He is a politician of the Democratic Party of Japan (DPJ), a member of the House of Councillors in the Diet (national legislature). A native of Mitsugi District, Hiroshima and graduate of Keio University, he was elected to the House of Representatives for the first time in 2000 as a member of Ichirō Ozawa's Liberal Party after running unsuccessfully in 1996 as a member of the New Frontier Party. After the Liberal Party merged with the DPJ, he won the 2003 re-election but lost the 2005 re-election. In 2007, he was elected to the House of Councillors for the first time.