| IWG | Integration Working Group | 集成工作组 |
| IWG | Informal Working Group | 非正式工作组 |
| IWG | International Working Group | 国际工作组 |
| IWG | Intelligence Working Group | 情报工作组 |
| IWG | Investigators Working Group (EOS) | 研究人员工作组（EOS） |
| IWG | Information Windowing Group | 信息窗口组 |
| IWG | Interoperability Working Group | 互操作性工作组 |
| IWG | Interface Working Group | 接口工作组 |
| IWG | Integrated Working Group | 综合工作组 |
| IWG | International Wenches Guild | 国际文斯公会 |
| IWG | Inches of Water Gauge (volume-flow rate) | 英寸水表（体积流量） |
| IWG | Iron-Wustite-Graphite | 铁-乌氏体石墨 |
| IWG | Instant Win Game | 即时获胜游戏 |
| IWG | Idiots with Guns | 持枪的白痴 |
| IWG | Implementation Working Group | 执行工作组 |
| IWG | International Working Group on Women and Sport | 国际妇女与体育工作组 |
| IWG | Investigation Working Group | 调查工作组 |
| IWG | Initialization Working Group | 初始化工作组 |
| IWG | Interactive Working Group | 互动工作组 |
| IWG | Interagency Working Group | 跨部门联合工作组 |