HDRO
| Acronym | Definition |
|---|---|
| HDRO | Herr Der Ringe Online (German: Lord of the Rings Online) |
| HDRO | Human Development Report Office (UN) |
| HDRO | High Desert River Outfitters (rafting; Oregon) |
| HDRO | Higher Degree Research Office (Macquarie University; North Ryde, New South Wales, Australia) |
| HDRO | Humanitarian Disaster Relief Operations |
| HDRO | Hook Data Readout |