| 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) |