NIWS
| Acronym | Definition |
|---|---|
| NIWS | Nights in White Satin (Moody Blues song) |
| NIWS | National Institute of Watersports (Panaji, Goa, India) |
| NIWS | National Institute for Workplace Safety (Longwood, FL) |
| NIWS | New Intelligent Workstation Systems Co. Ltd. (Japan) |
| NIWS | NATO Intelligence Warning System |
| NIWS | Northern Ireland Water Service (now Northern Ireland Water; UK) |