KOSU 91.7 FM is a radio station licensed to Stillwater, OK. The station broadcasts a Public Radio format and is owned by Oklahoma State University.
- Frequency: 91.7 FM
- City of license: Stillwater, OK
- Format: Public Radio
- Owner: Oklahoma State University
- Area: Oklahoma City
- First air date: December 29, 1955
- Website: www.kosu.org