| Acronym | Definition |
|---|
| NSSA | Not So Stubby Area (OSPF routing) |
| NSSA | National Scholastic Surfing Association |
| NSSA | National Skeet Shooting Association |
| NSSA | National Storm Shelter Association |
| NSSA | National Sportscasters and Sportswriters Association |
| NSSA | National Space Society of Australia |
| NSSA | Nova Scotia Snowboard Association (Canada) |
| NSSA | National Security Space Architect |
| NSSA | North-South Skirmish Association, Inc. |
| NSSA | National Social Science Association |
| NSSA | Norfolk Schools Sailing Association (UK) |
| NSSA | National Show Ski Association |
| NSSA | Nova Scotia Salmon Association |
| NSSA | National Schools Sailing Association |
| NSSA | National Swim School Association |
| NSSA | National Safe Skies Alliance |
| NSSA | National Sjogren's Syndrome Association |
| NSSA | Nebraska State Soccer Association |
| NSSA | National Sample Survey of Agriculture |
| NSSA | National Skating Suppliers Association |
| NSSA | Northeast States Sign Association |
| NSSA | National Sunday School Association |
| NSSA | Nebraska State Snowmobile Association |
| NSSA | Nebraska Shooting Sports Association |
| NSSA | Navy Space Systems Activity |
| NSSA | National Suffolk Sheep Association |
| NSSA | Network Services Security Administration |
| NSSA | Norwegian Social Security Agency |
| NSSA | National Security Space Acquisition |
| NSSA | Network for Sub-Saharan Africa |
| NSSA | Norfolk Ship Support Activity (US Navy) |