| Masaaki Ōsawa | |
| Native Name Lang: | ja |
| Office: | Governor of Gunma Prefecture |
| Term Start: | 28 July 2007 |
| Term End: | 27 July 2019 |
| Predecessor: | Hiroyuki Kodera |
| Successor: | Ichita Yamamoto |
| Birth Date: | 21 January 1946 |
| Birth Place: | Ōta, Gunma, Japan |
[1] was the governor of Gunma Prefecture in Japan. He was first elected in 2007 after serving in the assembly of Gunma Prefecture.