| Acronym | Definition |
|---|
| NCAS | National Capital Area Skeptics |
| NCAS | National Clinical Assessment Service (UK) |
| NCAS | National Carbon Accounting System (Australia) |
| NCAS | National Consortium for Academics and Sports (Orlando, FL) |
| NCAS | National Council against Smoking (est. 1976; South Africa) |
| NCAS | North Central Association of Schools |
| NCAS | Non-Call Associated Signaling (Telcordia) |
| NCAS | National Cyber Alert System |
| NCAS | network control ancillary services (electric power industry) |
| NCAS | National Claims Administrative Services, Inc. |
| NCAS | NERC (Natural Environment Research Council) Centres for Atmospheric Science (UK) |