| Acronym | Definition |
|---|
| HTN | High Blood Pressure |
| HTN | Hypertension |
| HTN | Hypotension |
| HTN | Heroes of the Nation (Redding, CA) |
| HTN | Histotechnology (program of study) |
| HTN | Hierarchical Task Network |
| HTN | Hair Transplant Network |
| HTN | Health Thru Nutrition (est. 1993) |
| HTN | Hammonton (Amtrak station code; Hammonton, NJ) |
| HTN | Hughes Television Network |
| HTN | Healthy Teen Network (Baltimore, MD) |
| HTN | High-Tech Network (various locations) |
| HTN | Help the Needy |
| HTN | Hospitality Training Network (Sydney, Australia) |
| HTN | Harmonic Termination Network (electrical engineering) |
| HTN | Health Transaction Network Inc. (Canada) |
| HTN | Home Theatre Network |
| HTN | Harvest The Net |