| SIR(S) | Standardized Incidence Ratio(S) 
| Others |
| SIRS | Safesite Internet Records System
| Others |
| SIRS | Salary Information Retrieval System
| Others |
| SIRS | Scalable Internet Resource Service
| Others |
| SIRS | Schizophrenia International Research Society
| Others |
| SIRS | School Improvement Research Series
| Others |
| SIRS | Scout International Relief Service
| Others |
| SIRS | Securities Information Retrieval Service
| Others |
| SIRS | Septic Inflammatory Response System
| Others |
| SIRS | Serials Issues Resources Series
| Others |
| SIRS | Shelbyville Industrial Rail Service
| Others |
| SIRS | Side Impact Restraint System
| Others |
| SIRS | Smart Indicators for Reflection Support
| Others |
| SIRS | Social Issue Research Services
| Others |
| SIRS | Social Issue Resource Series
| Others |
| SIRS | Social Issues Reference Service
| Others |
| SIRS | Social Issues Research Service
| Others |
| SIRS | Social Issues Resource Series
| Others |
| SIRS | Social Issues Resources Series
| Others |
| SIRS | Solar Infrared Radiation Station
| Others |
| SIRS | Sons In Retirement SIR
| Others |
| SIRS | Southern Indiana Resource Solutions
| Others |
| SIRS | Stennis Image Retrieval System
| Others |
| SIRS | Stores Inventory Request System
| Others |
| SIRS | Strategic Industry Reward Solutions
| Others |
| SIRS | Structure Inventory Records System
| Others |
| SIRS | Student Information Record System
| Others |
| SIRS | Student Information Reporting System
| Others |
| SIRS | Student Information Repository System
| Others |
| SIRS | Student Instructional Rating Survey
| Others |
| SIRS | Systemic Immune Response Syndrome
| Others |
| SIRS | Systemic Inflammatory Response Syndrome
| Others |