| Abbreviation | Definition |
|---|---|
| HORS | Hungarian Operations Research Society |
| HPAI | Highly pathogenic avian influenza |
| HPE | Human Post Effects |
| HPERD | Health Professions Education Research Day |
| HPFR | Healthy Processed Foods Research |
| HPICM | Hopping Probe Ion Conductance Microscopy |
| HPO | Human Phenotype Ontology |
| HPQ | Higher Project Qualification |
| HPR | Human Participation in Research |
| HPRT | Hypoxanthine-guanine phosphoribosyl transferase deficiency |
| HR | Hypocritical Researchers |
| HRA | Health Research Alliance |
| HRB | Health Research Board |
| HRB | Highway Research Board |
| HRC | Historic Research Center |
| HRC | Humanities Research Center |
| HRCC | Health Research Concepts Competition |
| HRCI | Health Research Challenge for Impact |
| HRCS | Health Research Classification System |
| HRCT | HIV Research Counseling and Testing |