IWA may refer to: Organizations International International Water Association International Webmasters Association International Woodworkers of America, United States and Canada International Workers Association, an anarcho-syndicalist federation of labour unions International Workingmen's Association (1864–1876), also known as the First International United Kingdom Indian Workers' Association Inland Waterways Association, a canal charity Institute of Welsh Affairs, a policy think-tank Elsewhere Independent Wrestling Association Mid-South, United States International Wrestling Alliance, Canada International Wrestling Association (disambiguation), various national bodies Irish Wheelchair Association, Ireland Places Iwa, Nepal, a defunct municipality (village development committee) Phoenix-Mesa Gateway Airport, Mesa, Arizona, US (FAA code: IWA) Other uses Great frigatebird (), an avian species Hurricane Iwa, a late-1982 storm on the Hawaiian Islands IWA OutdoorClassics, an arms trade show held annually in Nuremberg, Germany Integrated Windows Authentication, Microsoft term for a set of protocols International Workshop Agreement, a stage of ISO's standardization process