| Shōmei Yokouchi | |
| Native Name Lang: | ja |
| Order: | Governor of Yamanashi Prefecture |
| Term Start: | 17 February 2007 |
| Term End: | 16 February 2015 |
| Predecessor: | Takahiko Yamamoto |
| Successor: | Hitoshi Goto |
| Birth Date: | 2 March 1942 |
| Birth Place: | Nirasaki, Yamanashi, Japan |
| Alma Mater: | University of Tokyo |
was a Japanese politician. He represented the Yamanashi at-large district and later the Yamanashi 3rd district in the House of Representatives in the national Diet from 1993 until 2002 and was governor of Yamanashi Prefecture from 2007 until 2015. He was a graduate of the University of Tokyo Law Department.[1]