| Abbreviation | Definition |
|---|---|
| SIRA | Southwestern Intramural Recreational Activities |
| SIRA | Southwestern Intramural & Recreational Activities |
| SIRB | Seton Institutional Review Board |
| SIRB | Social Science/Behavioral/Education Institutional Review Board (Michigan State University) |
| SIRS | Student Information Record System |
| SIS | Science Information Systems |
| SIS | Student Information Services |
| SIS | Student Information System |
| SISR | Stetson Institute for Social Research |
| SISS | Student Information Services and Systems |
| SISTER | Soroptimists In Science, Technology, Engineering, and Research |
| SIT | School for International Training |
| SIT | School of Information Technology |
| SIT | Siddaganga Institute of Technology |
| SIT | Stevens Institute of Technology |
| SIT | Student Intervention Team |
| SITA | Students International Travel Association |
| SITC | Scottish Interactive Technology Centre |
| SITC | Spatial Information Technology Center |
| SITE | School of Information Technology and Engineering, VIT University |