| Abbreviation | Definition |
|---|---|
| NFAW | National Fraud Awareness Week |
| NFLD | National Family Literacy Day |
| NHD | National History Day |
| NIAW | National Infertility Awareness Week |
| NID | National Immunization Day |
| NLW | National Library Week |
| NMW | National Manufacturing Week |
| NMW | National Metric Week |
| NNW | National Nurses Week |
| NPAD | National Pet Adoption Day |
| NPHW | National Public Health Week |
| NPW | National Payroll Week |
| NPW | National Police Week |
| NSD | National Sportsmanship Day |
| NSD | No Such Date |
| NSFD | National SeaFood Day |
| NSW | National Service Week |
| NTUD | National Tibetan Uprising Day |
| NVD | New Vinyl Day |
| NVW | National Vegetarian Week |