RGA
- Hermes Quijada International Airport
- R/GA
- Reallexikon der Germanischen Altertumskunde
- Red-Green Alliance (Denmark)
- Regenerative amplification
- Reinsurance Group of America
- Relative gain array
- Renzo Gracie Academy
- Republican Governors Association
- Residual gas analyzer
- Restricted Growth Association
- Return goods authorization
- Rezerva generală a aviației
- Roller Girls of the Apocalypse
- Royal Garrison Artillery