| 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 |
