| RIR | Regional Internet Registry | 区域互联网注册管理机构 |
| RIR | Residual Impairment Ratio | 剩余减值比率 |
| RIR | Risk Identification Report | 风险识别报告 |
| RIR | Reference Intensity Ratio | 参考强度比 |
| RIR | right inferior rectus | 右下直肌 |
| RIR | right iliac region | 右髂区 |
| RIR | Riverside International Raceway | 河滨国际赛道 |
| RIR | Red de InformaciÓn Rural MÉxico | Red de InformaciÓn Rural MÉxico |
| RIR | Riverside Fla-Bob Airport, Riverside/ Rubidoux, California USA | Fla-Bob河畔,滨江/ Rubidoux机场,美国加利福尼亚州 |
| RIR | Resolve Initial References | 解析初始引用 |
| RIR | Rethink, Incorporate, and Rewrite | 重新思考、合并和重写 |
| RIR | Responses to Information Requests | 对信息请求的响应 |
| RIR | Royal Irish Rifles | 皇家爱尔兰步枪 |
| RIR | Rock in Rio (rock music festival) | 里约摇滚（摇滚音乐节） |
| RIR | Reduction in Recordable | 可记录的减少 |
| RIR | Regulatory Impact Review (fishing) | 监管影响审查（捕捞） |
| RIR | Rapid Incident Response | 快速事件响应 |
| RIR | Room Impulse Response (acoustics) | 房间脉冲响应（声学） |
| RIR | Richmond International Raceway | 国际赛道 |
| RIR | Reduction In Recruitment | 招聘人数减少 |
| RIR | Repatriation Information Report | 遣返信息报告 |
| RIR | radioisotope renogram | 放射性同位素肾图 |
| RIR | Royal Irish Regiment | 皇家爱尔兰军团 |
| RIR | Range Instrumentation Radar | 测距仪雷达 |
| RIR | Readiness Improvement Review | 准备状态改进审查 |
| RIR | Rapid Information Retrieval | 快速信息检索 |
| RIR | Refund Intercept Request | 退款拦截请求 |
| RIR | Receiving Inspection Report | 接收检验报告 |
| RIR | Rights and Interest Records | 权益记录 |
| RIR | Remedial Investigation Report | 补救调查报告 |