GSU may refer to one of several universities:
- Georgia State University, in Atlanta, Georgia, USA
- Governors State University in University Park, Illinois, USA
- Grambling State University, in Grambling, Louisiana, USA
- Galatasaray University in Istanbul, Turkey
- Gombe State University in Gombe State, Nigeria
- Georgia Southern University in Statesboro, Georgia, USA
GSU may also refer to:
- Gulf States Utilities, a subsidiary of Entergy Corporation
- General Service Unit a Kenyan paramilitary special forces unit.
- Genealogical Society of Utah
- Geographically Separate Unit, a small U.S. military base reliant on a separate parent base for support and administrative services.
- Gang Suppression Unit, a special unit of the Belize Police Department
- General support unit
- Granted-Service-Unit, a protocol element from the Diameter Credit-Control Application