| IRB | Institutional Review Board | 伦理委员会 |
| IRB | Industrial Relations Bureau | 劳资关系局 |
| IRB | Industrial Review Board | 工业检查委员会 |
| IRB | Insurance Rating Board | 保险定级委员会 |
| IRB | infrared brazing | 红外钎焊 |
| IRB | Internal Ratings Based (banking; risk management) | 基于内部评级（银行；风险管理） |
| IRB | Intel Research Berkeley (UC Berkeley) | 英特尔伯克利研究院（UC Berkeley） |
| IRB | Industrial Readjustment Branch | 工业调整处 |
| IRB | Internal Review Board | 内部审查委员会 |
| IRB | Industrial Regional Benefits | 工业区域效益 |
| IRB | Institut de RecherchÉ en Biotechnologie (French) | Institut de RecherchÉ en Biotechnologie (French) |
| IRB | Institute for Research in Biomedicine | 生物医学研究所 |
| IRB | Independent Review Board | 独立审查委员会 |
| IRB | Investment Review Board | 投资审查委员会 |
| IRB | Irregular Route Motor Carriers Bureau | 不规则路线汽车运输局 |
| IRB | Improved Ribbon Bridge | 改进的带形桥 |
| IRB | Internal Revenue Bulletin (Internal Revenue Service) | 国内税收公告（国内税收局） |
| IRB | Intelligence Review Board | 情报审查委员会 |
| IRB | Iron Rotating Band | 铁制天线旋转射束 |
| IRB | Independent Research Board | 独立研究委员会 |
| IRB | International Register on Biosafety | 国际生物安全登记册 |
| IRB | Institutional Review Board (approves research protocols at hospitals) | 机构审查委员会（批准医院的研究方案） |
| IRB | Irregular Billing | 不定期计费 |
| IRB | Interest Buy-Down | 利息买入 |
| IRB | Impulse Resistance Bridge | 脉冲电阻电桥 |
| IRB | Internationally Recognized Border | 国际公认的边界 |
| IRB | Industrial Relations Bulletin | 劳资关系公报 |
| IRB | Improved Rotor Blade | 改进的转子叶片 |
| IRB | Irish Republican Brotherhood | 爱尔兰共和党人兄弟会 |
| IRB | Infrastructure Review Board | 基础设施审查委员会 |
| IRB | Income Replacement Benefit (Ontario Accident Benefits Schedule) | 收入替代福利（安大略省事故福利计划） |
| IRB | Instrumentation/Relay Board | 仪表/传递板 |
| IRB | Individual Record(s) Brief | 个人记录摘要 |
| IRB | Inspection Review Board | 检查审查委员会 |
| IRB | Interface Requirements Board | 接口要求委员会 |
| IRB | Incident Report Book | 事故报告簿 |
| IRB | Independent Reading Book | 独立阅读本 |
| IRB | Internal Ratings Based | 基于内部评级 |
| IRB | International Republican Brotherhood | 国际共和党兄弟会 |
| IRB | I Ref Badly | 我引用错误 |
| IRB | Iraan, Texas USA | 美国德克萨斯州伊拉安 |
| IRB | Internal Revenue Bulletin | 国内收入公告 |
| IRB | International Rugby Board | 国际橄榄球委员会 |
| IRB | Inner Radiation Belt | 内部辐射带 |
| IRB | Industrial Relations Board | 工业关系委员会 |
| IRB | Industrial Revenue Bond | 工业收入债券 |
| IRB | Interruption Request Block | 中断请求块 |
| IRB | Integrated Routing and Bridging | 集成路由和桥接 |
| IRB | Immigration and Refugee Board (Canadian immigration) | 移民和难民委员会（加拿大移民局） |
| IRB | Indian Reserved Battalion | 印第安人保留营 |
| IRB | Industrial and Regional Benefits (Canada) | 工业和区域效益（加拿大） |
| IRB | Initial Review Board | 初步审查委员会 |
| IRB | Inspection Requirements Branch (US Navy) | 检验要求处（美国海军） |
| IRB | Incident Report Book (police) | 事件报告簿（警察） |
| IRB | Internal Review Budget | 内部审核预算 |
| IRB | Inshore Rescue Boat | 近岸救援船 |
| IRB | Internet Renaissance Band | 互联网复兴乐队 |
| IRB | I Are Back | 我回来了 |
| IRB | Inflatible Rescue Boat | 充气救生艇 |
| IRB | Inducto-Ratio Bridge | 电感比电桥 |