| Acronym | Definition |
|---|
| IWG➣International Working Group |
| IWG➣Instant Win Game |
| IWG➣Interagency Working Group |
| IWG➣Informal Working Group |
| IWG➣Implementation Working Group |
| IWG➣Interoperability Working Group |
| IWG➣Independent Working Group (various organizations) |
| IWG➣Integration Working Group |
| IWG➣International Working Group on Women and Sport |
| IWG➣Interface Working Group |
| IWG➣Intelligence Working Group |
| IWG➣Investigators Working Group (EOS) |
| IWG➣Interactive Working Group |
| IWG➣International Wenches Guild |
| IWG➣Investigation Working Group |
| IWG➣InterNetworking Working Group (est. 1972) |
| IWG➣Insured Window Guarantees, Ltd. (UK) |
| IWG➣Inches of Water Gauge (volume-flow rate) |
| IWG➣Integrated Working Group |
| IWG➣Information Windowing Group |
| IWG➣Initialization Working Group |
| IWG➣Iron-Wustite-Graphite |
| IWG➣Idiots with Guns |
| IWG➣Industrial Waste Group (Exton, PA; est. 1998) |