| Abbreviation | Definition |
|---|---|
| SD | Standard Doll |
| SD | Static Display |
| SDCF | Severni Draha Cisare Ferdinanda |
| SDS | Slotted Drive Shaft |
| SDU | Stamping Down Under |
| SDWC | San Diego Woman's Club |
| SDY | Starter Deck Yugi |
| SE | Simply Excellent |
| SEALS | Scuba Enthusiasts and Aquatic Life Savers |
| SEARCH | Supernatural Entity Anomaly Research & Cryptid Hunters |
| SEMB | SouthEast Michigan Boys Muscle Car Club |
| SETI | Search For Extra Terrestial Intelligence |
| SETI | Search for Extra-Terrestrial Intelligence |
| SETS | Sydney Electric Train Society |
| SEW | Sewing Enables Women |
| SEX | Secret Emotional Xchange |
| SF | Scarcely Found |
| SF | Street Fighter |
| SFAS | San Francisco Astrological Society |
| SFRC | Sang-Froid Riding Club |