| Abbreviation | Definition |
|---|---|
| NNRC | National Network Reporting Company |
| NNSC | North Newton School Corp |
| NNT | Neat Net Tricks |
| NNT | Needles-N-Things |
| NNT | Niagara Nature Tours |
| NNT | No Nos Tenemos |
| NNTC | Natural Nydegger Transport Corporation |
| NNTC | Northeast Nebraska Telephone Company |
| NNTC | Northern Nevada Title Company |
| NNW | Nikkei Network |
| NOA | Nintendo Of America |
| NOA | Noodles Of Amsterdam |
| NOAB | New Orleans Aviation Board |
| NOC | National Oil Corporation |
| NOC | Nepal Oil Corporation |
| NOC | North Oil Company |
| NOCA | No Other Charges Apply |
| NOCSA | National One Coat Stucco Association |
| NOEB | No One Else Brand |
| NOF | Networks Of Florida |