| Abbreviation | Definition |
|---|---|
| NSBA | Nassau Suffolk Bridge Association |
| NSBA | National School Boards Association |
| NSBA | Nova Scotia Boatbuilders Association |
| NSCA | National Street Car Association |
| NSCA | National Systems Contractors Association |
| NSCAA | National Soccer Coaches Association Of America |
| NSChE | Nigerian Society of Chemical Engineers |
| NSDA | National Soft Drink Association |
| NSDA | National Spasmodic Dysphonia Association |
| NSDA | North Sound Dietetic Association |
| NSDA | Nova Scotia Dietetic Association |
| NSDJA | National Sash and Door Jobbers Association |
| NSF | National Sanitation Foundation |
| NSF | National Science Foundation |
| NSFA | National Fire Sprinkler Association |
| NSFA | Nevada State Firefighters Association |
| NSFA | Nova Scotia Federation of Agriculture |
| NSGA | National Sand and Gravel Association |
| NSMA | National Securities Market Association (Russia) |
| NSPRA | National School Public Relations Association |