RG1

RG1 may refer to:

• Ginsenoside Rg1, a bioactive molecule
• a United Kingdom postcode covering Reading area
• RG-1 (propellant) is a Soviet/Russian rocket propellant similar to RP-1
• R1–RG1 (Rodalies de Catalunya), a commuter rail line in Catalonia, Spain

RG-I may refer to:

• Rhamnogalacturonan I, a type of pectin