| Acronym | Definition |
|---|
| IWO | Iwo Jima |
| IWO | Income Withholding Order |
| IWO | International Workers Order (1930-39) |
| IWO | I Want One |
| IWO | Independent Women's Organization (est. 1939) |
| IWO | Institution of Water Officers (UK) |
| IWO | In Way Of |
| IWO | Irish Weather Online (Ireland) |
| IWO | Industrial, Work and Organizational (psychology) |
| IWO | International Workcamp Organization (Seoul, South Korea) |
| IWO | I Will Owe (like IOU or bill me later) |
| IWO | Intelligence Watch Officer |
| IWO | Interim Waste Operations |
| IWO | Ian Wright Organisation (UK) |
| IWO | Inland Waterway Operation |
| IWO | Inter-Company Work Orders |
| IWO | Impotence World Institute |
| IWO | Interagency Work Order |
| IWO | Independent World Order |
| IWO | Internal Work Order |