| Kiyoshi Adachi | |
| Native Name: | 安達 澄 |
| Birth Date: | 14 December 1969 |
| Party: | Independent |
| Constituency: | Ōita at-large district |
| Predecessor: | Yōsuke Isozaki |
| Term Start: | 29 July 2019 |
| Term End: | 10 March 2023 |
| Birth Place: | Beppu, Ōita, Japan |
| Alma Mater: | Sophia University |
| Website: | 安達澄 |
Kiyoshi Adachi (born December 14, 1969, in Ōita Prefecture, Japan)[1] is a Japanese politician who served as a member of the House of Councillors of Japan from 2019 until his resignation in 2023 to run for Governor of Ōita Prefecture.[2] He represented the Ōita at-large district as an independent.
He was a member of the Committee on Financial Affairs.