| Abbreviation | Definition |
|---|---|
| NAAC | New Albany Aquatics Club |
| NAAC | North Atlantic Audi Club |
| NABAC | National Association of Boat Angling Clubs |
| NABC | North Andover Booster Club |
| NAC | Nashville Aquatic Club |
| NAC | Nebraska Actuaries Club |
| NAC | Newtown Athletic Club |
| NACC | National Autocycle and Cyclemotor Club |
| NACC | New Albany Country Club |
| NACCC | North American Club Crew Championships |
| NACS | North Actors Club Special |
| NACS | Northwest Aquatic Club Swimming |
| NACWC | National Association of Colored Women's Clubs |
| NADEC | Nerang and District Equestrian Club |
| NAFC | North Adelaide Football Club |
| NAFC | North American Fishing Club |
| NAFC | North American Founders Club |
| NAIC | National Association of Investment Clubs |
| NAOC | National Antique Oldsmobile Club |
| NARBC | National Angora Rabbit Breeders Club |