| Abbreviation | Definition |
|---|---|
| NACS | National Association of Convenience Stores |
| NACS | Nordic Association for China Studies |
| NACSE | National Association of Communication Systems Engineers |
| NACUBO | National Association of College and University Business Officers |
| NACUFS | National Association of College and University Food Services |
| NADA | NADANational Acupuncture Detoxification Association |
| NADAF | National Association of Decorative Architectural Finishers |
| NADC | National Association of Dredging Contractors |
| NADCA | National Air Duct Cleaners Association |
| NADCP | National Association of Drug Court Professionals |
| NADRA | North American Deck and Railing Association |
| NADS | North American Dipterists Society |
| NAE | National Academy of Engineering |
| NAEBA | National Association of Exclusive Buyer Agents |
| NAEBA | North American Elk Breeders Association |
| NAEC | National Association of Elevator Contractors |
| NAED | National Association of Electrical Distributors |
| NAEFCS | National Association of Extension Family and Consumer Scientists |
| NAESB | North American Energy Standards Board |
| NAFA | National Academy of Financial Accountants |