| IDU | I Don't Understand 
| Others |
| IDU | Illicit drug users
| Others |
| IDU | Immunisation and Diagnosis Unit
| Others |
| IDU | Inactive Duodenal Ulcer
| Others |
| IDU | Incremental Device Update
| Others |
| IDU | Independent Democratic Union
| Others |
| IDU | Indoor Unit
| Others |
| IDU | Injectable Drug Use
| Others |
| IDU | Injecting Drug Use
| Others |
| IDU | Injecting Drug User
| Others |
| IDU | Injecting Drug Users
| Others |
| IDU | Injection Drug Use
| Others |
| IDU | Injection Drug User
| Others |
| IDU | Injection Drug Users
| Others |
| IDU | Input and Display Unit
| Others |
| IDU | Instituto de Desarrollo Urbano
| Others |
| IDU | Integrated Desiccant Use
| Others |
| IDU | Intelligent Data Understanding
| Others |
| IDU | Intelligent Deadly and Unique
| Others |
| IDU | Inter Disaplinary Unit
| Others |
| IDU | Interactive Display Unit
| Others |
| IDU | Interface Data Unit
| Others |
| IDU | Interface Demonstration Unit
| Others |
| IDU | Interleaf Desktop Utility
| Others |
| IDU | Intermediate Diagnostic Units
| Others |
| IDU | Internal Defence Unit
| Others |
| IDU | International Democrat Union
| Others |
| IDU | Intravenous Drug Use
| Others |
| IDU | Intravenous Drug User
| Others |
| IDU | Ivy Dog Unit
| Others |