| Acronym | Definition |
|---|
| REG | Register |
| REG | Regular |
| REG | Region |
| REG | Regulation |
| REG | Registry (Microsoft Windows file extension) |
| REG | Regarding |
| REG | Registration |
| REG | Regina (Latin: Queen) |
| REG | Renewable Energy Generation (various locations) |
| REG | Race, Ethnicity and Gender |
| REG | Regal Entertainment Group |
| REG | Recovered Energy Generation (power plants) |
| REG | Rationeel Energiegebruik (Dutch: Rational Energy Use; Belgium) |
| REG | Reggie Miller |
| REG | Registry File |
| REG | Richard E. Grant (actor) |
| REG | Real Escape Game |
| REG | Random Event Generator |
| REG | Research Equipment Grant (various organizations) |
| REG | Real Estate Guys (radio show) |
| REG | Reed Electronics Group (Reed Elsevier Group) |
| REG | Rural Enterprise Gateway (UK) |
| REG | Referring Expression Generation |
| REG | Reggio Calabria, Italy - Tito Menniti (Airport Code) |
| REG | Rotor Excitation Generator (electricty) |
| REG | Golden Redfish |
| REG | Reno Evening Gazette |
| REG | Radioencephalogram |
| REG | Répertoire des Entreprises du Canton de Genève (French: Business Directory of Geneva; Switzerland) |
| REG | Regulate/Regulated/Regulating'Regulator |
| REG | Regular Electronic Giving (Lutheran Laypeople's League of Australia, Inc.) |
| REG | Reservatory for Endangered Games |
| REG | Range, Ephemeris, GMT |