IGG, IgG or igg may refer to: IGG Inc., a Chinese video game company IGG Software, an American software company Igiugig Airport, code IGG Immunoglobulin G, a type of antibody Independent Investigations Group, the former name of the Center for Inquiry Investigations Group (CIIG) Inert gas generator, a kind of machinery aboard tankers investigative genetic genealogy, utilizing genetic information for identifying suspects or victims in criminal cases See also IG (disambiguation)