RG
- American Mensa
- Capital in the Twenty-First Century
- Coaxial cable
- Direction centrale des renseignements généraux
- Guard (American football)
- Ibanez RG
- Land Systems OMC
- Pete RG
- Province of Ragusa
- RG Financial Corporation
- RG Heidelberg
- RG Line
- RG Sharma
- RG Snyman
- RG Veda
- RG color space
- RG postcode area
- RG-42
- RG-6 grenade launcher
- RG1 (disambiguation)
- RG2 (disambiguation)
- RG3 (disambiguation)
- Race Gurram
- Radius of gyration
- Razor Ramon RG
- Renormalization group
- ReplayGain
- ResearchGate
- Rhamnogalacturonan
- Rhythmic gymnastics
- Rio Grande (disambiguation)
- Roentgenium
- Rossiyskaya Gazeta
- Röhm Gesellschaft
- SSP Group
- Varig