| Abbreviation | Definition |
|---|---|
| SGP | Short Gaming Productions |
| SGS | Sustainable Gaming Systems |
| SGU | Surround Gaming Utility |
| SGX | SGalaxy Guild Xtreme |
| SHM | Super Hard Mode |
| SHP | Slap Happy Pirates |
| SIC | Sanitarium Insane Commandos gaming clan |
| SIC | Socom Intrusion Crew |
| SIE | Sony Interactive Entertainment |
| SIEGE | Southern Interactive Entertainment Gaming Expo |
| SIEGE | Student Interactive Entertainment Gaming Expo |
| SIGA | Saskatchewan Indian Gaming Authority |
| SIK | Silence is Key |
| SINC | Self Interfacing Neural Code |
| SIR | Stuck In Reality |
| SIR | Super Innocent Racing |
| SITG | Sycuan Institute on Tribal Gaming |
| SJP | Saint James Place |
| SKELE | Skeleton |
| SKELLY | Skeleton |