GCG

GCG may refer to:

;Biochemistry

• GCG, a codon for the amino acid alanine
• Gallocatechin gallate, a flavonol
• Proglucagon, a protein
• GCG (Genetics Computer Group) was a 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

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