IAG may refer to: Airport code Niagara Falls International Airport Companies Individualized Apparel Group, American clothing holding company Industrial Alliance Group, Canadian Insurance Company Insurance Australia Group, an insurance company in Australia International Airlines Group, holding company of Aer Lingus, British Airways, Iberia, Level and Vueling International Audio Group, a manufacturer of hi-fi equipment Other IAg, Immersion Silver plating, a conductor plating technology used for printed circuit boards I Am Ghost, a post-hardcore band from Long Beach, California Idiopathic adolescent gynecomastia, a medical condition International Association of Geodesy, part of the International Union of Geodesy and Geophysics Iraq Assistance Group, a former U.S. military command Louvain School of Management, formerly of the University of Louvain (UCLouvain) Microsoft Intelligent Application Gateway, a combined hardware and software computer product by Microsoft