IWA may refer to:
- Independent Wrestling Association Mid-South
- Indian Workers' Association
- Industrial, Wood and Allied Workers of Canada (IWA Canada), an autonomous branch of the former International Woodworkers of America trade union (IWA)
- Inland Waterways Association
- Institute of Welsh Affairs, a Welsh think-tank
- Integrated Windows Authentication
- International Water Association
- International Webcasting Association
- International Webmasters Association
- International Woodworkers of America
- International Workers Association is an anarcho-syndicalist federation of labour unions
- International Workshop Agreement, a stage of standardization process used by International Organization for Standardization
- International Workingmen's Association
- International Wrestling Association
- International Wrestling Association of Japan
- Irish Wheelchair Association
- Phoenix-Mesa Gateway Airport (FAA airport code: IWA) in Mesa, Arizona
- Iwa, the Great Frigatebird, a migratory seabird in the Northwestern Hawaiian Islands
- IWA and OUTDOORCLASSICS – Internationale Waffen Ausstellung (International Weapons Exhibition) - an exhibition taking place every year in Nuremberg/Germany
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