| Abbreviation | Definition |
|---|---|
| IWDS | Integrated Weapons Delivery System |
| IWEDA | Integrated Weather Effects Decision Aid |
| IWFNA | Inhibited White Fuming Nitric Acid |
| IWG | Intelligence Working Group |
| IWG | Interagency Working Group |
| IWG | Interface Working Group |
| IWG | Interoperability Working Group |
| IWI | Israel Weapon Industries |
| IWI | Isreali Weapon Industry |
| IWO | Iwo Jima |
| IWR | US Army Corps of Engineers Institute for Water Resources |
| IWS | Infantry Weapon System |
| IWS | Information Warfare Site |
| IWS | Integrated Weapons System |
| IWSC | Information Warfare Support Center |
| IWSD | Integrated Weapon System Display |
| IWT | Industrial (Aerodynamics) Wind Tunnel |
| IWT | Inland Water Transport |
| IWW | Inland Waterway |
| IWWS | Industry Weapon Web Services |