| Secure Software Design Architect | Academic & Science |
| Solar System Data Archive | Academic & Science |
| Solid-State Driver Amplifier | Academic & Science |
| Single-Stage Distributed Amplifier | Academic & Science |
| Stack Sequential Decoding Algorithm | Academic & Science |
| Synchronous Serial Data Adapter | Academic & Science |
| Social Science Data Analytics | Academic & Science |
| Salsa Spark Dance Academy | Academic & Science |
| Stout Student Dietetic Association | Academic & Science |
| Social Science Data Archive | Academic & Science |
| Sector Skills Development Agency (Great Britain) | Business |
| Swedish Securities Dealers Association | Business |
| Stanislaus Sworn Deputies Association | Community |
| South Suburban Darts Association | Community |
| Southland Sled Dog Association | Community |
| Saskatchewan Stock Dog Association | Community |
| Small School Districts' Association (Sacramento, CA) | Community |
| South South Development Academy | Community |
| Small School District Association | Community |
| Small School Districts Association | Community |
| Service Station Dealers of America | General |
| Structural steel design awards | General |
| Strategic Studies and Defense Analysis | General |
| Seismic Structural Design Associates | General |
| Sidemounter Scuba Diver Asia | General |
| Successive Similarity Detection Algorithm | General |
| Social Spatial and Dynamic Analysis | General |
| South Shore Dance Alliance | Governmental |
| Solid State Drive Alliance | Governmental |
| Sector Skills Development Agency | Governmental |
| South Sudan Defence Army | Governmental |
| Social Security Disability Act | Medical |
| Short Story Day Africa | Regional |
| Social Science Data Archives (Australian National University, now ASSDA) | Regional |
| Social Service Departments Activity | Regional |
| Split Soul Dance Academy | Regional |
| Split Sole Dance Academy (India) | Regional |
| Seminole Sports Dietetic Association | Sports |
| Seminole Sports Dietetics Association | Sports |
