| Abbreviation | Definition |
|---|---|
| NGA | National Gerbil Association |
| NGA | National Governors' Association |
| NGA | National Grocers Association |
| NGA | National Guardianship Association |
| NGA | National Gym Association |
| NGA | Northeast Gas Association |
| NGCA | National Golf Coaches Association |
| NGDA | National Glass Dealers Association |
| NGFA | National Grain and Feed Association |
| NGH | National Guild of Hypnotists |
| NGO | Non Governmental Organization |
| NGOs | Non-Governmental Organizations |
| NHA | National Helicopter Association |
| NHCA | National Hearing Conservation Association |
| NHCA | Nebraska Health Care Association |
| NHCA | New Hampshire Chess Association |
| NHCA | New Hampshire Chiropractic Association |
| NHDA | New Hampshire Dietetic Association |
| NHLA | National Hardwood Lumber Association |
| NHLSA | New Hampshire Land Surveyors Association |