| HPAC | Harvard Public Affairs & Communications 
| Others |
| HPAC | Haugh Performing Arts Center
| Others |
| HPAC | Havelock Performing Arts Center
| Others |
| HPAC | Hazard Prediction And Assessment Capability
| Others |
| HPAC | Hazards Prediction And Assessment Capability
| Others |
| HPAC | Health Policy Advisory Committee
| Others |
| HPAC | Health Professions Advisory Committee
| Others |
| HPAC | Heating Piping Air Conditioning
| Others |
| HPAC | Heating, Piping, and Air Conditioning
| Others |
| HPAC | Hedulehistoric Preservation Advisory Committee
| Others |
| HPAC | High Performance Auto Club
| Others |
| HPAC | Historic Preservation Advisory Committee
| Others |
| HPAC | Holy Pentecostal Assembly Churches
| Others |
| HPAC | Hospital Pharmaceuticals Advisory Committee
| Others |
| HPAC | Hyde Park Art Center
| Others |
| HPAC | Hyogo Performing Arts Center
| Others |