GGT

GGT may refer to:

Biology and medicine

 * Gamma-glutamyltransferase, an enzyme that catalyzes the reaction between a peptide and an amino acid
 * Glutathione hydrolase, an enzyme that hydrolyzes glutathione
 * A codon for the amino acid Glycine
 * Germline gene therapy, to treat genetic diseases

Language

 * Gitua language, spoken on New Guinea

Transport

 * Exuma International Airport, The Bahamas (IATA: )
 * Golden Gate Transit, a public transport system in California, U.S.