| SIRA | Association Senegalaise d'Importation de Representation Automobile 
| Others |
| SIRA | Scientific Informatics Research Academy
| Others |
| SIRA | Securities Industry Regulatory Authority
| Others |
| SIRA | Security Industry Regulation Authority
| Others |
| SIRA | Security Industry Regulatory Authority
| Others |
| SIRA | Selective Integrated Reading Activity
| Others |
| SIRA | Sentra Informasi Referendum Aceh
| Others |
| SIRA | Sentral Informasi Referendum Aceh
| Others |
| SIRA | Sentral Informasi Referendum Aceh (Aceh Referendum Information Center)
| Others |
| SIRA | Shiba Inu Rescue Association
| Others |
| SIRA | Simple Innovative Riding Acces
| Others |
| SIRA | Simple Innovative Riding Accessory
| Others |
| SIRA | Societa Industriale Automotoristiche Ricerche
| Others |
| SIRA | Society of Information Risk Analysts
| Others |
| SIRA | Solar Imaging Radio Array
| Others |
| SIRA | Southern Indiana Racing Association
| Others |
| SIRA | Southern Indiana Radiological Associates
| Others |
| SIRA | Southern Indiana REALTORS Association
| Others |
| SIRA | Southern Intercollegiate Rowing Association
| Others |
| SIRA | Southwestern Intramural & Recreational Activities
| Others |
| SIRA | Southwestern Intramural Recreational Activities
| Others |
| SIRA | Stable Isotope Ratio Analysis
| Others |
| SIRA | State Insurance Regulatory Authority
| Others |
| SIRA | Strategic Industry Research Analysis
| Others |
| SIRA | Strategic Information Research Analysis
| Others |
| SIRA | Study In Rigional Australia
| Others |
| SIRA | Suspicion Indicators Recognition and Assessment
| Others |
| SIRA | Swedish International Relief Association
| Others |
| SIRA | Systemic Infrastructure Resilience Analysis
| Others |