HFRR
| Acronym | Definition |
|---|---|
| HFRR | Horticulture, Forestry and Recreation Resources (Kansas State University; Manhattan, KS) |
| HFRR | High-Frequency Reciprocating Rig (diesel fuel) |
| HFRR | Hydrofluoric Acid Reprocessor Return System |
| HFRR | Health, Fitness, and Recreation Resources (George Mason University; Fairfax, VA) |