| Term | Full Form | Category |
|---|---|---|
| HHCS | Heartland Human Care Services | Others |
| HHCS | Henderson Hammock Charter School | Others |
| HHCS | Hereditary Hyperferritinaemia Cataract Syndrome | Others |
| HHCS | Hereditary Hyperferritinemia Cataract Syndrome | Others |
| HHCS | Heritage Hall Christian School | Others |
| HHCS | Hex Head Cap Screw | Others |
| HHCS | Hilton Head Choral Society | Others |
| HHCS | Holistic Home and Community services | Others |
| HHCS | HOPE for Hyndman Charter School | Others |
| HHCS | Hua Hsing Chinese School | Others |
| HHCS | Huber Heights City Schools | Others |