Organizations
- Royal Gibraltar Regiment, a regiment of the British military, the abbreviation is used in conjunction with rank, e.g. Captain, R.G.
- Direction centrale des renseignements généraux (aka Renseignements Généraux), the intelligence service of the French Police
- Iraqi Republican Guard, an Iraqi military force under Saddam Hussein
- R & G Financial Corporation (aka RG Financial or R-G Financial), a financial holding company located in San Juan, Puerto Rico
- Royal Greenland, a fishing and seafood processing company
- Roberts-Gordon LLC, an international manufacturer of HVAC equipment, controls and associated accessories, introduced the first vacuum assisted low-intensity, gas-fired infrared heating system into the market
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