| Acronym | Definition |
|---|
| NCSS | National Council for the Social Studies |
| NCSS | National Council of Social Service (Singapore) |
| NCSS | National Cooperative Soil Survey |
| NCSS | Non Commenting Source Statements |
| NCSS | National Conference of State Societies (Washington, DC) |
| NCSS | National Center for Sports Safety |
| NCSS | Nortel Certified Support Specialist |
| NCSS | Non-Clinical Support Services (various locations) |
| NCSS | National Center for Seeds and Seedlings (est. 1986; Japan) |
| NCSS | No-Cry Sleep Solution (book by Elizabeth Pantley and William Sears) |
| NCSS | National Computer Science School (Australia) |
| NCSS | Number Crunching Statistical System |
| NCSS | National Crash Severity Study (traffic accident analysis & reconstruction) |
| NCSS | Northwestern Counseling and Support Services (Vermont) |
| NCSS | National Coalition of Spaceport States |
| NCSS | National Cactus and Succulent Society |
| NCSS | National Council of State Societies |
| NCSS | North Coast Sailing Singles |
| NCSS | Naval Coastal Systems Station |
| NCSS | National Cyber Security Summit (Santa Clara, California.) |