| Abbreviation | Definition |
|---|---|
| SIMA | Social Impact Media Awards |
| SINPO | Strength, Interference, Noise, Propagation, Overall merit (code reporting international radio reception) |
| SIP | Special Interest Publication |
| SIP | Special Issue Presentation |
| SIPS | Simple Internet Publishing System |
| SIRS | Social Issues Resource Series |
| SIS | Sunne In Splendour |
| SIT | Seating Interior Theme |
| SITA | Société International de Télécommunications Aeronautiques |
| SITC | Sex In The City |
| SITCOM | Situation Comedy |
| SITE | Satellite Instructional Television Experiment |
| SITES | Snake In The Eagles Shadow |
| SIW | Smithsonian World |
| SJJ | Shirley Jean Johnson, Writer |
| SJM | San Jose Mercury News |
| SJP | Spiritual Journey Press |
| SKATE | Sap Knowledge Authoring Text Enhancement |
| SKD | Schedule |
| SL | Scottish Lass |