| Abbreviation | Definition |
|---|---|
| NNC | Natural Nail Care |
| NNC | Norgaard Neale Camden, Ltd., Chartered Accountants |
| NNDC | Nebraska Northwest Development Corporation |
| NNDC | North Northants Development Company |
| NNDC | Northern Nigeria Development Company |
| NNEC | Northern Neck Electric Cooperative |
| NNG | Near Normal Grotto |
| NNG | Nielsen Norman Group |
| NNG | Northern Natural Gas |
| NNGE | Navajo Nation Gaming Enterprises |
| NNH | Number of Non Households |
| NNI | New Neighborhoods Inc |
| NNI | Northland Neighborhoods Inc |
| NNL | New Neighbors League, Inc. |
| NNOC | National Negro Opera Company |
| NNPC | Nigeria National Petroleum Corporation |
| NNPC | Nigerian National Petroleum Company |
| NNPC | Nigerian National Petroleum Corporation |
| NNPC | Nigerian National Petroluem Corporation |
| NNPC | Northern Nigeria Petroleum Corporation |