CGN may refer to: CGN, a gene that encodes for the protein cingulin Ceredigion, formerly Cardiganshire, historic county in Wales, Chapman code China General Nuclear Power Group, a Chinese energy company Compagnie Générale de Navigation sur le lac Léman, a Swiss company operating boats on Lake Léman Childhood gender nonconformity, a childhood behavioral pattern CGN, IATA code for Cologne Bonn Airport, Germany CGN, National Rail station code for Cogan railway station, Wales CGN, U.S. Navy designation for a nuclear-powered guided missile cruiser Carrier-grade NAT, an approach to IPv4 network design where end sites are configured with private network addresses CGN, cis Golgi network, compartment of the Golgi apparatus Crescentic glomerulonephritis, a syndrome of the kidney that is characterized by a rapid loss of kidney function CGN, Computer Glitch Ninjas, A computer hardware and software hacker collective.