| Abbreviation | Definition |
|---|---|
| NSSDC | National Skill Standard Development Committee |
| NSSTA | National Structured Settlements Trade Association |
| NSTA | National School Transportation Association |
| NSTA | National Science Teachers Association |
| NTA | National Tax Association |
| NTA | National Taxidermists Association |
| NTA | National Textile Association |
| NTA | National Tour Association |
| NTA | National Trappers' Association |
| NTA | Nunavut Teachers' Association |
| NTA | Nutritional Therapist Association |
| NTBA | National Town Builders Association |
| NTBA | North Texas Blacksmiths Association |
| NTBA | Northern Transvaal Bee Association |
| NTCA | National Tuberculosis Controllers Association |
| NTDS | North Texas Dental Society |
| NTF | National Turkey Federation |
| NTF | No-Till Farmer |
| NTGSN | National Tuberculosis Genotyping and Surveillance Network |
| NTHS | National Technical Honor Society |