NIWC
| Acronym | Definition |
|---|---|
| NIWC | Northern Ireland Women's Coalition |
| NIWC | Northern Illinois Women's Center (Rockford, IL) |
| NIWC | Northern Illinois Water Corporation |
| NIWC | National Institute for Women of Color (est. 1981) |
| NIWC | Naval Information Warfare Center |
| NIWC | Naval Inshore Warfare Command |
| NIWC | Northern Ireland Water Council (UK) |