| Acronym | Definition |
|---|
| IDU | Iraqi Democratic Union |
| IDU | I Don't Understand |
| IDU | Indoor Unit (wireless) |
| IDU | Injecting Drug User (medical/health) |
| IDU | Intravenous Drug Use |
| IDU | Intelligent Data Understanding |
| IDU | Interface Demonstration Unit |
| IDU | Incremental Device Update |
| IDU | Indoor Unit |
| IDU | Instituto de Desarrollo Urbano (Colombia) |
| IDU | International Democrat Union |
| IDU | Interface Data Unit |
| IDU | Idoxuridine |
| IDU | Interdisciplinary Unit |
| IDU | Initial Daily Use (FAA) |
| IDU | Interactive Display Unit |
| IDU | Identity of Ultimate Recipient (FIPS) |
| IDU | Input and Display Unit |
| IDU | Initial Distribution Update |
| IDU | Intel Developer Update |
| IDU | Internal Development Unit (systems and software) |
| IDU | Internal Defence Unit (Sierra Leone) |
| IDU | Insert, Delete and Update |
| IDU | Irritation During Urination (band; UK) |