| Abbreviation | Definition |
|---|---|
| SDLA | San Diego Lighting Association |
| SDLL | Sime Darby London Ltd |
| SDNBHD | Sendirian Berhad (Incorporated in Malay) |
| SDPI | Southern Digital Products Inc |
| SDPI | Superior Drilling Products Inc |
| SDS | Sacandaga Dog Supply |
| SDS | Srpska Demokratska Stranka |
| SDS | Sterker Door Strijd |
| SDS | Superior Detection Systems |
| SDS | Surf, Dive, 'n' Ski |
| SDSCA | Sharp Document Solutions Company of America |
| SDSI | San Diego Seal Inc |
| SDSI | Surgical Development Systems Inc |
| SDSI | Synergetic Data Systems Inc |
| SDT | Scheme of Digital Transmission |
| SDT | Security Dynamics Technologies (Company) |
| SDTC | San Diego Transit Corporation |
| SDTC | South Dakota Trust Company |
| SDTC | Sustainable Development Technology Canada |
| SDTI | San Diego Trolley Inc |