| Term | Full Form | Category |
|---|---|---|
| HRHS | Halifax Regional Health System | Others |
| HRHS | Hampshire Regional High School | Others |
| HRHS | Harrisonburg Rockingham Historical Society | Others |
| HRHS | Heritage Regional High School | Others |
| HRHS | Hickory Ridge High School | Others |
| HRHS | Highlands Ranch High School | Others |
| HRHS | Holy Redeemer High School | Others |
| HRHS | Holy Rosary High School | Others |
| HRHS | Hot Rod Heritage Series | Others |
| HRHS | Hutchinson Regional Healthcare System | Others |
| HRHS | Hypoplastic Right Heart Syndrome | Others |