| Acronym | Definition |
|---|
| HCN➣Hydrogen Cyanide (prussic acid, hydrocyanic acid) |
| HCN➣High Country News (Paonia, CO) |
| HCN➣Hardware Change Notification |
| HCN➣Ho-Chunk Nation |
| HCN➣Harford Cable Network (Bel Air, MD) |
| HCN➣Health Communication Network |
| HCN➣Hyperpolarisation-Activated Cyclic Nucleotide-Gated Channel (protein) |
| HCN➣Health Card Number (universal health care; Canada) |
| HCN➣Hispanic Communications Network (Washington, DC) |
| HCN➣Host Country National |
| HCN➣Hospice Care Network (New York) |
| HCN➣Health Care News (monthly publication; Heartland Institute) |
| HCN➣Heterogeneous Computer Network |
| HCN➣Hollywood Citizen-News (Hollywood, CA) |
| HCN➣Health Council of the Netherlands |
| HCN➣Heritage Conservation Network (India) |
| HCN➣Hotel Confirmation Number (travel reservation) |
| HCN➣Hypercube Connected Network |