ATG may refer to: Companies ATG Stores, an e-tail site Advanced Technology Group (Apple), a former division of Apple Computer Advanced Technology Group (Novell), a former division of Novell Aviation Technology Group, the defunct developer of the Javelin Very Light Jet (VLJ) Military Alaska Territorial Guard, a military reserve force in World War II Anti-tank gun, a mobile weapon used in Anti-tank warfare Organizations Alternative Tourism Group, a Palestinian NGO Ambassador Theatre Group, a theatre group in the UK Science ATG, the triplet code for the amino acid methionine and a start codon Anti-thymocyte globulin, antibodies to prevent and treat transplant rejection Autophagy gene, a gene coding for protein that facilitates autophagy Other uses Ankara Tren Garı, a mixed use building in Ankara, Turkey Anti Tank Guitar, a string instrument Art Technology Group, a software developer Art Theatre Guild, a Japanese film production company Auto-gating, in night vision devices The ISO 3166 code for Antigua and Barbuda, a country in the east Caribbean Sea