| Keitarō Arima | |
| Pseudonym: | Pitarō Arima, Pīttarō Arima, Haruo Arima |
| Birth Date: | January 13, 1969 |
| Birth Place: | Osaka, Japan |
| Nationality: | Japanese |
| Occupation: | Manga artist |
is a Japanese manga artist, best known as the creator of . He was a member of the Manga Dōkōkai OB at Kansai University. His pen names include, and .