| HSAC | Harvard Sports Analysis Collective 
| Others |
| HSAC | Hawaii State Association Of Counties
| Others |
| HSAC | Health Science Advisory Commitee
| Others |
| HSAC | Health Science Advisory Committee
| Others |
| HSAC | Health Sciences Advisory Committee
| Others |
| HSAC | Health Sector Advisory Council
| Others |
| HSAC | Health Service Advisory Committee
| Others |
| HSAC | Health Services Advisory Council
| Others |
| HSAC | Helicopter Safety Advisory Conference
| Others |
| HSAC | Help Stop Animal Cruelty
| Others |
| HSAC | High School Affiliated Club
| Others |
| HSAC | High School of Applied Communication
| Others |
| HSAC | High Speed Ac Joint
| Others |
| HSAC | Hmong Student Association of Colorado
| Others |
| HSAC | Homeland Security Advisory Council
| Others |
| HSAC | Homeless Services Assessment Center
| Others |
| HSAC | Honors Student Advisory Committee
| Others |
| HSAC | Honors Student Advisory Council
| Others |
| HSAC | Hospitality Services Advisory Committee
| Others |
| HSAC | Housing Selection Advisory Committee
| Others |
| HSAC | Human Services Advisory Councils
| Others |
| HSAC | Humane Society of Alamance County
| Others |
| HSAC | Humane Society of Atlantic County
| Others |