| Abbreviation | Definition |
|---|---|
| SLJ | Sentinels of Liberty and Justice |
| SLMM | Saunders Lakeland Mountain Marathon |
| SLMP | St. Lawrence Motorsports Park |
| SLO | Senior League Official |
| SLOC | Salt Lake Olympic Committee |
| SLPL | Sri Lanka Premier League |
| SLR | Saturday Long Run |
| SLR | Smells Like Records |
| SLR | Sport Light Racing |
| SLU | Starting Line Up |
| SLUT | Sadistic Legion Of Unreal Tournament |
| SLW | Surf Life For Women |
| SM | Score Of Matching |
| SM | Super Mongo |
| SMAC | Saturday Morning Athletic Club |
| SMAC | Seacoast Martial Arts Center |
| SMAC | Smith Martial Arts Club |
| SMAC | Sport Martial Arts Champions |
| SMAC | Swindon Mini Associates Club |
| SMART | Sports Medicine And Reconditioning Team |