GCG

GCG may refer to:


 * Biochemistry
 * GCG, a codon for the amino acid alanine
 * Gallocatechin gallate, a flavonol
 * Proglucagon, a protein
 * GCG (General Computer Group) was collection of programs for the analysis of gene and protein sequences, now defunct


 * Medical
 * Ghost cell glaucoma


 * Other
 * Gallantry Cross, Gold of the Republic of Venda
 * Geological Curators' Group, a UK charity promoting geology
 * Global Church of God, a Sabbatarian church based in England
 * Government College Gujranwala, in Pakistan
 * The Grilled Cheese Grill, an American restaurant chain
 * Guardian Capital Group, a Canadian financial services company
 * Gwaun-Cae-Gurwen, a village in Neath Port Talbot, Wales
 * Knight Grand Cross of the Royal Guelphic Order, a Hanoverian order of chivalry