| Acronym | Meaning |
| NASS | National Accident Sampling System |
| NASS | National Agricultural Statistics Service |
| NASS | National Assembly (UK) |
| NASS | National Asylum Support Service (UK) |
| NASS | National Automotive Sampling System (US DOT) |
| NASS | Naval Academy Sailing Squadron |
| NASS | Naval Academy Summer Seminar (summer admissions program for prospective students) |
| NASS | Naval Air Signal School (US Navy) |
| NASS | Nebraska Agricultural Statistics Service |
| NASS | Ngee Ann Secondary School (Singapore) |