| SIR | Safe Impact Round 
| Others |
| SIR | Safety Information Registration
| Others |
| SIR | Safety Interlock Relay
| Others |
| SIR | Said In Respect
| Others |
| SIR | Sample Inspection Report
| Others |
| SIR | Sampling Importance Resampling
| Others |
| SIR | Sampling, Importance, Re-sampling
| Others |
| SIR | Saskatchewan International Raceway
| Others |
| SIR | Sasti International Randi
| Others |
| SIR | Save Instruction Recognition
| Others |
| SIR | Scale, Intensity, and Risk
| Others |
| SIR | Scholar In Residence
| Others |
| SIR | School Improvement Review
| Others |
| SIR | Science Information Robot
| Others |
| SIR | Scientific Information Retrieval
| Others |
| SIR | SCImago Institutions Rankings
| Others |
| SIR | Scottish Ice Rink
| Others |
| SIR | Screening Information Request
| Others |
| SIR | Sebring International Raceway
| Others |
| SIR | Secondary Image Registration
| Others |
| SIR | Security Intelligence Report
| Others |
| SIR | Seditious Info Realm
| Others |
| SIR | Select Income REIT
| Others |
| SIR | Select Income REIT (Real Estate Investment Trust)
| Others |
| SIR | Selective Information Retrieval
| Others |
| SIR | Selective Internal Radiation
| Others |
| SIR | Self Insured Retention
| Others |
| SIR | Self-Insured Retention
| Others |
| SIR | Senior Individual Revenge
| Others |
| SIR | Sensitive Information Remediation
| Others |
| SIR | Sentencing Information Report
| Others |
| SIR | Sequential Injection Racing
| Others |
| SIR | Serial Infra Red
| Others |
| SIR | Serial Infra-Red
| Others |
| SIR | Serious Incident Report
| Others |
| SIR | Service Indicator Reset
| Others |
| SIR | Service Information Rule
| Others |
| SIR | Service Inspired Restaurants
| Others |
| SIR | Service Interval Reminder
| Others |
| SIR | Service Interval Reset
| Others |
| SIR | Service Investigation Report
| Others |
| SIR | Shuttle Imaging Radar
| Others |
| SIR | Signal-to-Interference Ratio
| Others |
| SIR | Silencing Information Regulator
| Others |
| SIR | Silent Information Regulator
| Others |
| SIR | Simulated Intelligence Robotics
| Others |
| SIR | Sitzelektrik Rechts
| Others |
| SIR | Sixth Industrial Revolution
| Others |
| SIR | Size Interview Rate
| Others |
| SIR | Skill Is Required
| Others |
| SIR | Skill, Integrity, and Responsibility
| Others |
| SIR | Slave I Remain
| Others |
| SIR | Small Instance Relaxation
| Others |
| SIR | Smodcast Internet Radio
| Others |
| SIR | Smooth Interpersonal Relationship
| Others |
| SIR | Sniffer, Installer, and Reporter
| Others |
| SIR | Social Innovation Rockstars
| Others |
| SIR | Society of Insurance Research
| Others |
| SIR | Society of Interventional Radiology
| Others |
| SIR | Society of Interventional Radiology's
| Others |
| SIR | Software Initiated Restart
| Others |
| SIR | Soil Insect Rating
| Others |
| SIR | Solitaire file Bitmap graphics
| Others |
| SIR | Sons In Retirement
| Others |
| SIR | Sort Interval Recursive
| Others |
| SIR | Southeastern Institute of Research
| Others |
| SIR | Southern Indiana Region
| Others |
| SIR | Spatial Impulse Response
| Others |
| SIR | Speaker Independent Recognition
| Others |
| SIR | Special Inspection Requests
| Others |
| SIR | Special Investment Region
| Others |
| SIR | Specific Information Requirement
| Others |
| SIR | Speed, Integrity, and Reliability
| Others |
| SIR | Spokane Indian Reservation
| Others |
| SIR | Sport Injected Race
| Others |
| SIR | Staff Individualised Record
| Others |
| SIR | Standard Informational Robot
| Others |
| SIR | Standard Infra Red
| Others |
| SIR | Standard Interconnection Requirements
| Others |
| SIR | Standardized Incidence Ratios
| Others |
| SIR | Standardized Infection Ratio
| Others |
| SIR | Statement of Intent to Register
| Others |
| SIR | Staten Island Railroad
| Others |
| SIR | Staten Island Railway
| Others |
| SIR | Statistical Information Retrieval
| Others |
| SIR | Statistical Inventory Reconciliation
| Others |
| SIR | Stepped Impedance Resonator
| Others |
| SIR | Strategically Integrated Reinforcements
| Others |
| SIR | Strict Independent Respectful
| Others |
| SIR | Strike It Rich
| Others |
| SIR | String Instrument Repair
| Others |
| SIR | Stuck In Reality
| Others |
| SIR | Student Issues Roundtable
| Others |
| SIR | Studio Instrument Rental
| Others |
| SIR | Studio Instrument Rentals
| Others |
| SIR | Super Info Robot
| Others |
| SIR | Super Innocent Racing
| Others |
| SIR | Superior Information Robot
| Others |
| SIR | Supplemental Inflatable Restraint
| Others |
| SIR | Supplemental Information Report
| Others |
| SIR | Supplier Information Requests
| Others |
| SIR | Surface Insulation Resistance
| Others |
| SIR | Surveillance Information Retrieval
| Others |
| SIR | Susceptible Infected and Recovered
| Others |
| SIR | Susceptible Infected Recovered
| Others |
| SIR | Susceptible Intermediate and Resistant
| Others |
| SIR | Susceptible, Infected, and Recovered
| Others |
| SIR | Sustained Information Rate
| Others |
| SIR | System Interface Requirement
| Others |
| SIR | System Internal Resource
| Others |
| SIR | System Investigation Request
| Others |
| SIR | Systems Integration Review
| Others |