| Abbreviation | Definition |
|---|---|
| SD | San Diego Padres |
| SD | Seima Densetsu computer game |
| SD | Singles and Doubles |
| SD | Specialist Division |
| SD | Sudden Death |
| SD | Sun Dome |
| SD | Superior Defender |
| SD | Swiftly Defeated |
| SDA | Special Defense Academy |
| SDCSC | San Diego Council of Ski Clubs |
| SDE | Sports Drugs And Entertainment |
| SDE | Sports Drugs Entertainment |
| SDF | Stade De France |
| SDFC | Swan Districts Football Club |
| SDFC | Sydney Dream Football Club |
| SDG | Single Digit Greats |
| SDGA | San Diego Golf Academy |
| SDH | Smack Down Hotel |
| SDHSA | Stittsville and Dwyer Hill Snowmobile Association (now merged into the BEAST) |
| SDI | Scuba Diving International |