| Abbreviation | Definition |
|---|---|
| SIPL | State In Programming Languages |
| SIR | System Investigation Request |
| SIRB | Software Industry Research Board |
| SIS | Shimano Index Shifting |
| SIS | Spectrum Internet Suite |
| SIS | Symbian Installation System |
| SISO | Samsung India Software Operations |
| SISO | Single Input, Single Output |
| SISS | Software Infrastructures for Smart Space |
| SIT | System Integration Testing |
| SITA | Sahaja Internet Team Administration |
| SITA | Service Information and Technology Architecture |
| SITA | Société Internationale de Télécommunications Aéronautiques (in French) International Aeronautical Telecommunications Society |
| SITK | Software Installation Tool Kit |
| SIW | System Information for Windows |
| SJP | Soap Json Proxy |
| SJX | Small Job Express |
| SK | Session Key |
| SK | Software Kit |
| SK | Spiral Knights |