GCG may refer to:
;Biochemistry
* GCG, a codon for the amino acid
alanine
Alanine (symbol Ala or A), or α-alanine, is an α-amino acid that is used in the biosynthesis of proteins. It contains an amine group and a carboxylic acid group, both attached to the central carbon atom which also carries a methyl group sid ...
*
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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