| Abbreviation | Definition |
|---|---|
| NCB | National Council for Cement and Building Materials (India) |
| NCMA | National Concrete Masonry Association |
| NECTA | North East Culinary Trade Association |
| NEMA | National Electrical Manufacturers Association |
| NEMI | Non-Executive Mineral Interest |
| NFCA | National Fireproofing Contractors Association |
| NFSA | National Fire Sprinkler Association |
| NGFB | North Guildford Food Bank |
| NHPD | National Housing Preservation Database |
| NKBA | National Kitchen & Bath Association |
| NLLPA | Newfoundland and Labrador Lumber Producers Association |
| NOFTA | Negros Organic and Fair Trade Association |
| NPTA | National Paper Trade Association |
| NYCTA | New York Coal Trade Association |
| OALA | Ontario Association of Landscape Architects |
| OBTA | Oregon Business Travel Association |
| OCCD | Office of Client and Cultural Diversity |
| OFTA | Offshore Financial Trade Association |
| OHRSA | Ontario Home Respiratory Services Association |
| OLMA | Ontario Lumber Manufacturers Agency |