IIO
| Acronym | Definition |
|---|---|
| IIO | Independent Investigations Office (British Columbia, Canada) |
| IIO | Inverse Interest Only |
| IIO | Immigration Information Officers (US Department of Homeland Security) |
| IIO | Indian Inventors' Organization |
| IIO | Initial Investigating Officer |
| IIO | Interallied Insurance Organization |
| IIO | Inertial Instrument/Instrumentation Organization/Operation |
| IIO | International Intergovernmental Organization |