| Term | Full Form | Category |
|---|---|---|
| NIWG | Network and Infrastructure Working Group | Others |
| NIWG | Network Implementation Working Group | Others |
| NIWG | Neutrino Interactions Working Group | Others |
| NIWG | NextGen Integration Working Group | Others |
| NIWG | Non Inflationary Wage Growth | Others |
| NIWG | Northern Illinois Wine Growers | Others |
| NIWG | Numbering Industry Working Group | Others |
| NIWG | Nursing Informatics Working Group | Others |