HDRA
| Acronym | Definition |
|---|---|
| HDRA | Henry Doubleday Research Association |
| HDRA | Histoculture Drug Response Assay |
| HDRA | High Desert Racing Association (est. 1976) |
| HDRA | Heavy Duty Representatives Association (Elgin, IL) |
| HDRA | Hemispherical Dielectric Resonator Antenna |
| HDRA | Holeshot Drag Racing Association |