This has multiple meanings:
- Tosu language ( Qiangic, Tibeto-Burman)
- Tosu, a city in Japan
- Sagan Tosu, Tosu's professional football club
- tOSU, an abbreviation for The Ohio State University normally used to distinguish it from other OSU's, Oklahoma State University and Oregon State University.
- Toșu, last name in Romania
- Tosu, Russia, a selo in Vilyuysky District, Sakha Republic