| Acronym | Definition |
|---|
| SIDI | Spark Ignited Direct Injection |
| SIDI | Standardized Information on Dietary Ingredients |
| SIDI | Société d'Investissement et de Développement International (French: International Development and Investment Company) |
| SIDI | Spark-Ignition Direct-Injection (GM engine type) |
| SIDI | Sociedad Iberoamericana de Intervencionismo (Spanish: Congress of the Iberoamerican Society of Interventional; radiology) |
| SIDI | Societa Italiana di Ippologia (Italian: Italian Hippological Society; equine medicine) |
| SIDI | Summer Instructional Development Institute (University of Pittsburgh; Pittsburgh, PA) |
| SIDI | State of Illinois Department of Insurance |