| SIR | Surface Impedance Resistance | 表面阻抗测试 |
| SIR | Supplemental Inflatable Restraint | 安全气囊 |
| SIR | Society of Independent Representatives Inc | 独立代表协会 |
| SIR | Society of Individual Rights (1960s San Francisco homophile group) | 个人权利协会（20世纪60年代旧金山亲同性恋团体） |
| SIR | Sequential Independent Reviews | 连续独立审查 |
| SIR | Supplier Information Request | 供应商信息请求 |
| SIR | Scheduled Inspection and Repair | 定期检查和维修 |
| SIR | Snow and Ice on Runway | 跑道上的冰雪 |
| SIR | Serial Infrared | 串行红外线 |
| SIR | Society of Insurance Research | 保险研究学会 |
| SIR | Statistical Information Retrieval | 统计信息检索 |
| SIR | Scientific Information Retrieval | 科学信息检索 |
| SIR | Signal-to-Interference Ratio | 信号干扰比 |
| SIR | Security Intelligence Report (Microsoft threat analysis) | 安全情报报告（Microsoft威胁分析） |
| SIR | Simple Indexing and Retrieval | 简单索引和检索 |
| SIR | System Investigation Request | 系统调查请求 |
| SIR | Society of Interventional Radiology | 介入放射学学会 |
| SIR | Shuttle Imaging Radar | 航天飞机成像雷达 |
| SIR | Surface Insulation Resistance | 表面绝缘电阻 |
| SIR | Standardized Incidence Ratio | 标准化发病率 |
| SIR | Statistical Inventory Reconciliation | 统计库存调节 |
| SIR | Statement of Intent to Register (College) | 注册意向声明（学院） |
| SIR | Supervised Intensive Restitution (Alabama prison program) | 监督强化遣返（阿拉巴马州监狱计划） |
| SIR | Sons In Retirement (Northern California retired men's luncheon club) | 儿子(北加利福尼亚的退休的人退休的午宴俱乐部) |
| SIR | Self-Insured Retention | 自保保留金 |
| SIR | Singapore Immigration and Registration | 新加坡移民和登记 |
| SIR | Safeguards Implementation Report | 保障措施实施报告 |
| SIR | Spatial Impulse Response | 空间脉冲响应 |
| SIR | Standard-Issue Information Retrieval Unit (Invader Zim) | 标准问题信息检索单元（入侵者Zim） |
| SIR | Source Initiated Reservation | 源启动的保留 |
| SIR | Surveillance Information Retrieval (gaming) | 监控信息检索（游戏） |
| SIR | Speech Intelligibility Rating | 语音清晰度评级 |
| SIR | Susceptible-Infected-Removed | 去除易感感染 |
| SIR | Special Inspection Requirement | 特殊检查要求 |
| SIR | Search, Inspection & Recovery | 搜索、检查和恢复 |
| SIR | Smooth Interpersonal Relationship | 顺畅的人际关系 |
| SIR | System Integration Review | 系统集成审查 |
| SIR | Standard Information Retrieval unit | 标准信息检索单元 |
| SIR | Stored Information Retriever | 存储信息检索器 |
| SIR | Staten Island Railway (NY, formerly SIRT, Staten Island Rapid Transit) | 斯塔滕岛铁路（纽约，前身为SIRT，斯塔滕岛捷运） |
| SIR | Sensitive, Intermediate, Resistant | 敏感、中等、耐受 |
| SIR | single isomorphous replacement | 单同种异体置换 |
| SIR | specific immune release | 特异性免疫释放 |
| SIR | sirupus | 锡鲁普斯 |
| SIR | Self Insured Retention | 自保保留金 |
| SIR | Sampling Importance Resampling | 采样重要性重新采样 |
| SIR | Sustained Information Rate | 持续信息率 |
| SIR | Spokane Indian Reservation | 斯波坎印第安人保留地 |
| SIR | Sion, Switzerland | 瑞士Sion |
| SIR | System Internal Resource | 系统内部资源 |
| SIR | Skill Integrity And Responsibility | 技能诚信和责任 |
| SIR | Silencing Information Regulator | 消音信息调节器 |
| SIR | Sons In Retirement | 退休的儿子 |
| SIR | Susceptible Infected And Recovered | 易感感染和恢复 |
| SIR | Staten Island Railway | 斯塔滕岛铁路 |
| SIR | Southern Indiana Region | 印第安纳州南部地区 |
| SIR | Science Information Robot | 科学信息机器人 |
| SIR | Solitaire file Bitmap graphics | 纸牌文件位图图形 |
| SIR | Speed Integrity And Reliability | 速度完整性和可靠性 |
| SIR | School Improvement Review | 学校改善审查 |
| SIR | Small Instance Relaxation | 小实例松弛 |
| SIR | Supervisor Investigation Reports (insurance) | 主管调查报告（保险） |
| SIR | Simulated Intelligence Robotics | 模拟智能机器人 |
| SIR | Statutory Invention Registration | 依法登记的发明 |
| SIR | Standard Indonesian Rubber | 标准印尼橡胶 |
| SIR | Singapore Infantry Regiment | 新加坡步兵团 |
| SIR | Summary Information Return | 摘要信息返回 |
| SIR | Session Initiation Request | 会话启动请求 |
| SIR | Safety Interlock Relay | 安全联锁继电器 |
| SIR | Serious Incident Report | 严重事件报告 |
| SIR | Sequential Importance Resampling | 顺序重要性重采样 |
| SIR | Sample Inspection Report (engineering prototype) | 样品检验报告（工程样机） |
| SIR | Silent Information Regulator | 无声信息调节器 |
| SIR | Scramble Intercept Recovery | 加扰截获恢复 |
| SIR | Skill Independent Regional (Visas) | 技能独立地区（签证） |
| SIR | Service Information Request | 服务信息请求 |
| SIR | Selected Ion Recording (mass spectrometry) | 选择性离子记录（质谱） |
| SIR | Sorry If Repost | 抱歉，如果重发 |
| SIR | Switched Integrated Rectifier (three phase transformer-rectifier power supply) | 开关集成整流器（三相变压器整流器电源） |
| SIR | Smith Industrial Rubber | 史密斯工业橡胶 |
| SIR | Screening Information Request (US FAA; same as RFP) | 筛选信息请求（美国联邦航空局；与RFP相同） |
| SIR | SociÉtÉ Ivoirienne de Raffinage (Abidjan, Ivory Coast) | SociÉtÉ Ivoirienne de Raffinage (Abidjan, Ivory Coast) |
| SIR | Site Inspection Request | 现场检查请求 |
| SIR | Submarine Intermediate Reactor | 海底中间反应堆 |
| SIR | Set Iron Rod | 固定铁棒 |
| SIR | specific information requirement (US DoD) | 特定信息需求（美国国防部） |
| SIR | Sooner International Raceway | Souer国际赛车场 |
| SIR | Sigma Iota Rho (international studies honorary society) | Sigma Iota Rho（国际研究荣誉学会） |
| SIR | Safety Investigation Report | 安全调查报告 |
| SIR | Sveriges Inredningsarkitekters Riksförbund | Sveriges Inredningsarkitekters Riksförbund |
| SIR | Scholar in Residence | 居士 |
| SIR | Spaceborne Imaging Radar | 星载成像雷达 |
| SIR | Savings-to-Investment Ratio | 储蓄与投资比率 |
| SIR | Special Investigative Requirement | 特殊调查要求 |
| SIR | Stepped Impedance Resonator | 阶跃阻抗谐振器 |
| SIR | Service Implementation Repository | 服务实施库 |
| SIR | System Incident Report | 系统事件报告 |
| SIR | Seattle International Raceway | 西雅图国际赛车场 |
| SIR | Security Incident Report | 安全事件报告 |