| Kazuki Kosakai | |
| Native Name: | 小堺 一機 |
| Birth Date: | 3 January 1956 |
| Birth Place: | Ichikawa, Chiba, Japan |
| Nationality: | Japanese |
| Years Active: | 1977–present |
| Children: | Shōta Kosakai |
| Notable Work: | Lion no Gokigen'yoh |
| Website: | https://web.archive.org/web/20090228090249/http://www.asaikikaku.co.jp/profile/kosakai/ |
| Footnotes: | Same year/generation as: George Tokoro Shoji Murakami LaSalle Ishii |
(born January 3, 1956) is a Japanese comedian and actor from Ichikawa, Chiba. He is attached to Asaikikaku.