GRR
- Agroar Carga Aérea
- Gadalar railway station
- Gainesville Roller Rebels
- Gate River Run
- Georgetown Railroad
- Gerald R. Ford International Airport
- Gibran Rakabuming Raka
- Gradual release of responsibility
- Grand River Railway
- Great River Road
- Green Reefers
- Gross reproduction rate
- Grothendieck–Riemann–Roch theorem
- Grrr (disambiguation)
- Gurara language
- ISO 639-3
- Vernon J. Ehlers Station