| Abbreviation | Definition |
|---|---|
| HARP | High Altitude Research Program |
| HARP | Hyperloop Advanced Research Partnership |
| HARPA | Helping AIDS in Resource Poor Areas |
| HARS | High Altitude Research Station |
| HARV | High Alpha Research Vehicle |
| HAT | Hypoxanthine-aminopterin-thymidine medium |
| HBT | Horizons in Biblical Theology |
| HCDT | Hybrid Collaborative Delivery Team |
| HCIR | Human Computer and Information Retrieval |
| HCMR | Hellenic Center for Marine Research |
| HCMR | Hellenic Centre for Marine Research |
| HCR | Human Communication Research |
| HCRC | Health Communication Research Center |
| HCRC | Human Capital Research Collaborative |
| HCRC | Human Capital Research Corporation |
| HCRC | Human Communication Research Centre |
| HCRI | Harish-Chandra Research Institute |
| HCRI | Harper Cancer Research Institute |
| HCRI | Healthy Communities Research Initiative |
| HCRI | Home Care Research Initiative |