GRB

• ASX stock code for Gage Roads Brewing Company, an Australian brewery
• Game Rating Board, former name of the South Korean game rating organization
• GRB Studios, an American television production company

• Gamma-ray burst, an astronomical event
• Granzyme B (GrB), serine protease most commonly found in the granules of NK cells and cytotoxic T cells
• .grb, the file extension of GRIB files

• Station code for Great Bentley railway station, in Essex, England
• IATA and FAA codes for Green Bay–Austin Straubel International Airport, in Wisconsin, U.S.

• George R. Brown Convention Center, in Houston, Texas, U.S.
• Postal code for Għarb, Gozo Island, Malta
• ISO 639-2 and 639-3 codes for Grebo language, a Kru language spoken in Liberia and the Ivory Coast

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