| Acronym | Definition |
|---|
| HARP | Health Administration Responsibility Project |
| HARP | High Altitude Research Project (NASA study of the upper atmosphere by instruments shot from a cannon) |
| HARP | Home Affordability Refinance Program |
| HARP | Harappa Archaeological Research Project (Pakistan) |
| HARP | Hybrid Automated Reliability Predictor |
| HARP | Hypoprebetalipoproteinemia, Acanthocytosis, Retinitis Pigmentosa, and Pallidal Degeneration |
| HARP | High Altitude Release Point |
| HARP | Hybrid Ad-Hoc Routing Protocol |
| HARP | Health Activities Recommendation Panel |
| HARP | Health and Air Research Program |
| HARP | Harmonic Phase Imaging (radiology) |
| HARP | High-gain Avalanche Rushing Photoconductor (TIA - TV camera device) |
| HARP | High Altitude Reconnaissance Platform |
| HARP | Historic Aircraft Restoration Projects (Floyd Bennett Field, Brooklyn, NY) |
| HARP | Historical Area Rejuvenation Project |
| HARP | Hackers Against Racist Parties |
| HARP | Harrier Action Review Panel |
| HARP | Hyperbolic Retarding Potential Analyzer |
| HARP | Hubble Aberration Recovery Program |
| HARP | High School Association for the Research of Principle |
| HARP | Humanistic American Religious Party (right-wing non-denominational religious party) |
| HARP | Hazard Assessment of Rocket Propellants |
| HARP | Holiday Accident Reduction Program (US Marine Corps) |
| HARP | Helicopter Advance Readiness Program |
| HARP | Hometown Assistance Recruiting Program (US Navy) |
| HARP | Hornby Area Ratepayers (Canada) |