| Kamegawa Seibu | |
| Native Name: | 亀川 盛武 |
| Native Name Lang: | ja |
| Office: | sanshikan of Ryukyu |
| Term Start: | 1871 |
| Term End: | 1872 |
| Predecessor: | Yonabaru Ryōkyō |
| Successor: | Urasoe Chōshō |
| Birth Date: | 1808 |
| Birth Place: | Ryukyu Kingdom |
| Death Date: | 13 November 1880 |
| Death Place: | Shuri, Okinawa, Empire of Japan |
| Blank1: | Childhood name |
| Blank2: | Chinese name |
| Data2: | Mō Inryō (毛 允良) |
| Blank3: | Rank |
| Data3: | Ueekata |
, also known by the Chinese-style name, was a politician and bureaucrat of Ryukyu Kingdom.
Kamegawa was selected as a member of the Sanshikan in 1871, but was forced to retire by Japan in the next year because he was strongly pro-Chinese.
After Ryukyu was annexed by Japan in 1879, Kamegawa Seibu became the chief leader of anti-Japanese factions. He sent his grandson Kamegawa Seitō (Japanese: 亀川 盛棟, also known as Mō Yūkei Japanese: 毛 有慶) to Fuzhou to request China negotiate it with Japan. In the next year, Seitō came back to Shuri and spread rumors that Chinese troops would come to liberate Ryukyu soon. The Kamegawa family was arrested by police, and tortured in the prison. Seibu was released on 3 November, but died ten days later.