| Acronym | Definition |
|---|
| NNA | National Notary Association (Chatsworth, California) |
| NNA | Nissan North America Inc. |
| NNA | Nissan North America |
| NNA | National News Agency (Lebanon) |
| NNA | National Newspaper Association |
| NNA | Nine Network Australia |
| NNA | Northern Nevada Aquatics (Reno, NV) |
| NNA | Nevada Nurses Association |
| NNA | Neonatal Nurses Association |
| NNA | Need Not Apply |
| NNA | Net New Assets |
| NNA | National Nursing Association |
| NNA | Neuroscience and Neuropsychology of Aging Program (NIA) |
| NNA | Nebraska Nurses Association |
| NNA | Northern Nevada Aviation (flight school; Reno, NV) |
| NNA | Nebraska Numismatic Association |
| NNA | Neutral Non-Allied |
| NNA | National Nertz Association (gaming group) |