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

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( haw, 'iwa, link=no), 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 {{disambiguation