GRG

GRG or variant thereof, may refer to:
 * Gerontology Research Group, (GRG) American social sciences research group
 * GRG Banking, a Chinese corporation manufacturing ATMs
 * Global Restructuring Group of Royal Bank of Scotland
 * GrG, the astronomical abbreviation for group of galaxies
 * grg, the ISO:639 language code for the Gira language
 * Gathorne Robert Girdlestone (1881–1950), British surgeon
 * GRG Matriculation Higher Secondary School, in Coimbatore, Tamil Nadu, India
 * Georges River Grammar School, in Georges River, New South Wales