| HRR | Hard Rolling Reverse 
| Others |
| HRR | Haskell Relational Record
| Others |
| HRR | Headington Road Runners
| Others |
| HRR | Health Readiness Record
| Others |
| HRR | Health Registries for Research
| Others |
| HRR | Heart Rate Reserve
| Others |
| HRR | Heat Release Rate
| Others |
| HRR | Henley Royal Regatta
| Others |
| HRR | Her Royal Roommatedness
| Others |
| HRR | Herrera, Colombia
| Others |
| HRR | Hierarchical Redundancy Removal
| Others |
| HRR | Hierarchical Round Robin
| Others |
| HRR | High Repetition Rate
| Others |
| HRR | High Resolution Radar
| Others |
| HRR | High River Rentals
| Others |
| HRR | Higher Reduced Rate
| Others |
| HRR | Hillbilly Road Rodders
| Others |
| HRR | Hillslope River Routing
| Others |
| HRR | Historic Road Rally
| Others |
| HRR | History Records Register
| Others |
| HRR | Home Residence Requirement
| Others |
| HRR | Homologous Recombination Repair
| Others |
| HRR | Hosp Readmission Reduction
| Others |
| HRR | Hospital Readmissions Reduction
| Others |
| HRR | Hospital Referral Region
| Others |
| HRR | Hot Rod Reissue
| Others |
| HRR | Hot Rod Reunion
| Others |
| HRR | Hot Rod Revival
| Others |
| HRR | Howard Rogers Room
| Others |
| HRR | Hungarian Retro Rally
| Others |
| HRR | Hunter Resource Recovery
| Others |
| HRR | Hybrid Ring Resonator
| Others |
| HRR | Rockwell R Hardness Number
| Others |