| Acronym | Definition |
|---|
| HDU➣Hong Duc University (Vietnam) |
| HDU➣High Dependency Unit |
| HDU➣Header and Data Unit |
| HDU➣High-Density Urethane |
| HDU➣Hemodialysis Unit |
| HDU➣Himeji Dokkyo University (Japan) |
| HDU➣Home Dialyzors United (patient organization) |
| HDU➣Human Development Unit (various organizations) |
| HDU➣Health Development Unit (UK and Australia) |
| HDU➣Hose Drum Unit (air to air refueling) |
| HDU➣Helmet Display Unit |
| HDU➣Hard Disk Unit |
| HDU➣Harley-Davidson University (service school operated by the factory) |
| HDU➣Horizontal Drive Unit |
| HDU➣How Dare You (Internet slang) |
| HDU➣Hot Death Uno (game) |
| HDU➣Heat Dissipation Unit |
| HDU➣Hose and Drogue Unit (air to air refueling) |
| HDU➣Hydraulic Drive Unit |
| HDU➣Head-End Distribution Unit |
| HDU➣Hazardous Device Unit |
| HDU➣Homeless Diversion Unit (New York City) |