IWA
- Great frigatebird
- Hurricane Iwa
- IWA OutdoorClassics
- Independent Wrestling Association Mid-South
- Indian Workers' Association
- Indonesian Women's Alliance
- Inland Waterways Association
- Institute of Welsh Affairs
- Institute of World Affairs
- Integrated Windows Authentication
- International Water Association
- International Webmasters Association
- International Woodworkers of America
- International Workers Association
- International Workingmen's Association
- International Workshop Agreement
- International Wrestling Alliance
- International Wrestling Association (disambiguation)
- Irish Wheelchair Association
- Iwa Island
- Iwa K
- Iwa Koesoemasoemantri
- Iwa Moto
- Iwa Shrine
- Iwa Wanja
- Iwa, Nepal
- List of villages in Oyo State
- Mwanga language
- Phoenix-Mesa Gateway Airport
- Princess Iwa
- Uryu Iwako