RG

RG, Rg or rg may refer to:

People

RG postcode area, the postal address for the area of Reading and surrounding towns in England
Province of Ragusa, Sicily, Italy, vehicle registration prefix

Radio Guide, used to specify Coaxial cables (including a list of RG cable types)
ReplayGain, a proposed standard for normalizing the perceived loudness of digital audio playback
ResearchGate, a social network for scientists and researchers

RG-6 grenade launcher, a Russian weapon
RG-42, a Russian fragmentation grenade
armored vehicles designed by Land Systems OMC, South Africa (including a list of RG-type vehicles)

RG, or Rail Gourmet, a food brand and a division of SSP Group
Radius of gyration, several related measures of the size of an object, a surface, or an ensemble of points
Reachability Graph, a formal verification technique
Renormalization group, in physics, a mathematical apparatus allowing investigation of a system at different size scales
RG color space, a color space
- rg chromaticity, a two-dimensional color space in which there is no intensity information
Rhamnogalacturonans, a type of pectin
Roentgenium, symbol Rg, a chemical element

Direction centrale des renseignements généraux or Renseignements Généraux, a defunct French interior intelligence agency
Ibanez RG, a series of electric guitars produced by Hoshino Gakki
r > g, an economics equation fundamental to Capital in the Twenty-First Century
Regional Gathering, an event hosted by local chapters of American Mensa
RG Financial Corporation, a financial holding company located in San Juan, Puerto Rico
RG Line, a Finnish shipping company
RG Veda, a Japanese manga first published in 1989
Race Gurram, 2014 Indian film abbreviated as RG
Röhm Gesellschaft or RG, a German brand of firearms (including a list of RG-type models)
Rossiyskaya Gazeta, a Russian newspaper
Varig (1927-2006), Brazilian airline (IATA code RG)
A RG (Roof Garden) level in a building, also called Lower Penthouse (LPH) or a level where there is a rooftop garden in some buildings