| Acronym | Definition |
|---|
| NNTC➣National No-Tillage Conference (agriculture) |
| NNTC➣National NeuroAIDS Tissue Consortium (est. 1998) |
| NNTC➣Northeast Nebraska Telephone Company (Jackson, NE) |
| NNTC➣Norwich and Norfolk Terrier Club |
| NNTC➣Nari Nari Tribal Council (est. 2000; Australia) |
| NNTC➣Northern Networks Trade Conference (annual) |