| Abbreviation | Definition |
|---|---|
| SISP | Società Italiana di Scienza Politica |
| SIST | Society for Imaging Science & Technology |
| SISTERS | Sustaining Interest in Science Technology Engineering and Research in Society |
| SISV | Singapore Institute of Surveyors and Valuers |
| SITE | Society for Information Technology in Education |
| SITE | Society of Insurance Trainers Educators |
| SItI | Italian Society for Hygiene, Preventive Medicine and Public Health |
| SItI | Societ Italiana di Igiene, Medicina Preventiva e Sanit Pubblica |
| SITJ | Savez In~enjera i Tehni ara Jugoslavije |
| SITJ | Savez Inenjera i Tehniara Jugoslavije |
| SITJ | Savez Inženjera i Tehnicara Jugoslavije |
| SITJ | Union of Engineers and Technicians of Yugoslavia |
| SITY | Society of Interpreters and Translators of Yukon |
| SIU | International Society of Urology |
| SIU | Société Internationale d'Urologie |
| SIU | Socit Internationale d'Urologie |
| SIV | Italian Society of Virology |
| SIV | Societ Italiana di Virologia |
| SIV | Società Italiana di Virologia |
| SIWI | Society of Independent Workplace Investigators |