| IAR | Instruction Address Register | 指令地址寄存器 |
| IAR | Intersection of Air Routes | 航路交叉点 |
| IAR | Intelligent Automatic Rerouting | 智能型自动重选路由 |
| IAR | Intake Air Resonator | 进气共鸣器 |
| IAR | International Association of Rubberists | 国际橡胶协会 |
| IAR | Independent Annual Review | 独立年度审查 |
| IAR | Investment Analysis Report | 投资分析报告 |
| IAR | Independent Architecture Review | 独立架构审查 |
| IAR | Initial Assessment Report | 初步评估报告 |
| IAR | Instantaneous-to-Average Power Ratio | 瞬时与平均功率比 |
| IAR | Initiative for Architectural Research | 建筑研究倡议 |
| IAR | Instruction Approval Release | 指令批准发布 |
| IAR | Interim Assistance Reimbursement | 临时援助报销 |
| IAR | Institute for American Relations | 美国关系研究所 |
| IAR | Inter-Agency Rate | 机构间汇率 |
| IAR | Irradiation Anneal Reirradiation | 辐照退火再辐照 |
| IAR | International Animal Rescue | 国际动物救援 |
| IAR | Interoperability Assessment Report | 互操作性评估报告 |
| IAR | Institute for Agricultural Research (Nigeria) | 农业研究所（尼日利亚） |
| IAR | Independent Assessment Report | 独立评估报告 |
| IAR | Institute for Aerospace Research | 航空航天研究所 |
| IAR | Immediate-Phase Asthmatic Reaction | 立即期哮喘反应 |
| IAR | Institute of Audio Research | 音频研究所 |
| IAR | immediate asthmatic reaction | 立即哮喘反应 |
| IAR | inhibitory anal reflex | 抑制性肛门反射 |
| IAR | Yaroslavl, Russia | 俄罗斯雅罗斯拉夫尔 |
| IAR | I Am Replying | 我正在回复 |
| IAR | Industria Aeronautic Romana | 罗马航空工业 |
| IAR | Inventory Adjustment Report | 库存调整报告 |
| IAR | Ignore All Rules (Wikipedia) | 忽略所有规则（维基百科） |
| IAR | Investment Advisor Representative | 投资顾问代表 |
| IAR | Instruction Access Register | 指令访问寄存器 |
| IAR | Internal Anomaly Report | 内部异常报告 |
| IAR | Inertial Attitude Reference | 惯性姿态基准 |
| IAR | Imagery Analysis Report | 图像分析报告 |
| IAR | Immediate Air Request | 立即空中请求 |
| IAR | Illinois Auto Racing | 伊利诺伊州赛车 |
| IAR | In A single Round (gaming) | 单回合（游戏） |
| IAR | Intra-Area Routing (Cisco) | 区域内路由（Cisco） |
| IAR | ISDN Automatic Recall | ISDN自动调用 |
| IAR | Initial Address Register | 初始地址寄存器 |
| IAR | Incident/Accident Report | 事故/事件的报告 |
| IAR | Intelligence Area of Responsibility | 情报责任区 |
| IAR | Initial Address Reject (ATMF) | 初始地址拒绝（ATMF） |
| IAR | Internal Assessment Review | 内部评估审查 |
| IAR | Inventory Adjustment Rate | 库存调整率 |
| IAR | Integrated Avionics Racks | 集成航空电子机架 |