| Abbreviation | Definition |
|---|---|
| SDK | San Diego Kings |
| SDL | Sudden Death League |
| SDO | Sports Development Office |
| SDO | Sports Development Officer |
| SDO | Sudden Death Overtime |
| SDOS | Sum of Defeated Opponents' Score |
| SDP | San Diego Padres |
| SDP | Steepest Descent Path |
| SDRC | San Diego Running Community |
| SDRCC | Sport Dispute Resolution Centre of Canada |
| SDS | Sit Down Start |
| SDT | San Diego Tekken |
| SDU | Skydive University |
| SDUS | Saint Denis Union Sports |
| SDZ | Sydney Dance Zone |
| SE | Spirit Energy |
| SE | Sports Edition |
| SE | Sports Entertainment |
| SE | Start End |
| SEA | Skill Enthusiasm Attitude |