| Kei Kusunoki | |
| Birth Name: | Mayumi Ōhashi |
| Birth Date: | March 24, 1966 |
| Birth Place: | Iwakura, Aichi, Japan |
| Nationality: | Japanese |
| Occupation: | Manga artist |
| Relatives: | Kaoru Ohashi (sister) |
| Website: | K2Office |
, better known by her pen name, is a Japanese manga artist known for her horror and comedy manga series. Her notable works include Yagami-kun no Katei no Jijō, Ogre Slayer, and Girls Saurus.
Kusunoki was born on 24 March 1966 in Iwakura, Aichi Prefecture. She is married and has a daughter Hana and a son. Kusunoki has collaborated with her twin sister Kaoru Ōhashi, who also works as a manga artist.
Kusunoki has focused most of her career on anime production. She debuted as a manga artist in 1982 in Ribon Original with Nanika ga Kanojo Tōri Tsuita?. Kusunoki had stopped writing manga for a period in order to cope with a miscarriage before returning and writing Bitter Virgin. Most of her works have not been officially translated and published in English.