IWA or Iwa may refer to:
Organizations International Institute of World Affairs 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 Indonesian Women's Alliance, a political group representing around 90 organisations in Indonesia International Wrestling Alliance, Canada International Wrestling Association (disambiguation), various national bodies Irish Wheelchair Association, Ireland
People Princess Iwa (died 347), Japanese princess and empress consort of Emperor of Japan Nintoku Iwa Koesoemasoemantri (1899–1971), Indonesian politician Iwa K, Indonesian rapper, singer, songwriter, TV presenter and actor Iwa Kusuma (born 1970) Iwa Moto, stage name of Japanese–Philippine actress, model and reality television personality Aileen Quimado Iwamoto (born 1988) Uryu Iwako (1829–1897), also known as Uryū Iwa, Japanese social worker Iwa Wanja, Bulgarian actress born Ivanka Nikolova Yanakieva (1905–1991)
Places Iwa, Nepal, a defunct municipality (village development committee) Iwa, Nigeria, a village - see List of villages in Oyo State (postal code 202111) Iwa Island, Papua New Guinea
Other uses Great frigatebird (), an avian species Hurricane Iwa, a late-1982 storm on the Hawaiian Islands Iwa, a dialect of the Mwanga language, spoken in Zambia 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 IWA, FAA code for Phoenix-Mesa Gateway Airport, Mesa, Arizona, United States
See also Iwa Shrine, a Shinto shrine in the city of Shisō, Hyōgo Prefecture, Japan