| HARC | Hagerstown Area Religious Council 
| Others |
| HARC | Halon Alternatives Research Corporation
| Others |
| HARC | Hawaii Agriculture Research Center
| Others |
| HARC | Hazard Analysis and Risk Control
| Others |
| HARC | Health Assessment Resource Center
| Others |
| HARC | Helping the At Risk Community
| Others |
| HARC | Herefordshire Archive and Records Centre
| Others |
| HARC | Heritage Arabian Racing Club
| Others |
| HARC | Historic Architectural Review Commission
| Others |
| HARC | Historic Automobile Racing Club
| Others |
| HARC | Historische Auto Ren Club
| Others |
| HARC | HIV/AIDS Resource Center
| Others |
| HARC | Hoarding of Animals Research Consortium
| Others |
| HARC | Homeschool Academic Resource Center
| Others |
| HARC | Horticulture and Agroforestry Research Center
| Others |
| HARC | Hospital Alliance for Research Collaboration
| Others |
| HARC | Housing Activities Resources Council
| Others |
| HARC | Houston Advanced Research Center
| Others |
| HARC | Houston Aphasia Recovery Center
| Others |
| HARC | Houston Athletic Rugby Club
| Others |
| HARC | Human Advancement and Repopulation Corporation
| Others |
| HARC | Huntsville Amateur Radio Club
| Others |
| HARC | Husky Amateur Radio Club
| Others |
| HARC | Hydraulic Automatic Retarder Control
| Others |