| Acronym | Definition |
|---|
| HCGS➣Hubbard Center for Genome Studies (est. 2001; University of New Hampshire) |
| HCGS➣Henry County Genealogical Services (Indiana) |
| HCGS➣Helpful Critical Guy Syndrome (Scott Adams) |
| HCGS➣Hope Creek Generating Station |
| HCGS➣Harrison County Genealogical Society (Woodbine, IA) |
| HCGS➣Highlands County Genealogical Society (Florida) |