IAG may refer to:
Companies IA Financial Group, a Canadian Insurance Company Individualized Apparel Group, an American clothing holding company Independent Artist Group, talent agency Insurance Australia Group, an insurance company in Australia International Airlines Group, a holding company of Aer Lingus, British Airways, Iberia, Level and Vueling International Audio Group, a manufacturer of hi-fi equipment
Other organisations International Association of Geoanalysts, an international not-for-profit learned society International Association of Geodesy, part of the International Union of Geodesy and Geophysics Louvain School of Management, formerly of the University of Louvain (UCLouvain)
Other uses I Am Ghost, a post-hardcore band from Long Beach, California I Am Groot, a series of animated shorts IAG, airport code for Niagara Falls International Airport IAg, Immersion Silver plating, a conductor plating technology used for printed circuit boards Idiopathic adolescent gynecomastia, a medical condition Iraq Assistance Group, a former U.S. military command Microsoft Intelligent Application Gateway, a combined hardware and software computer product by Microsoft