| SIDI | Saudi Information Development Industries 
| Others |
| SIDI | Societa Italiana di Ippologia Italian Association of Equine Practitioners
| Others |
| SIDI | Spark Ignited Direct Injection
| Others |
| SIDI | Spark Ignition Direct Injection
| Others |
| SIDI | Standard Intermediate Data Item
| Others |
| SIDI | Standardized Information on Dietary Ingredients
| Others |
| SIDI | State of Illinois Department of Insurance
| Others |