| Acronym | Definition |
|---|
| HFD | Happy Friendship Day |
| HFD | Hartford (Amtrak station code; Hartford, CT) |
| HFD | House of Flying Daggers (movie) |
| HFD | Honolulu Fire Department (Honolulu, HI) |
| HFD | Heat Flux Density |
| HFD | High-Functioning Depression (psychiatry) |
| HFD | High-Frequency Detection (machinery) |
| HFD | Houston Fire Department |
| HFD | Hartford-Brainard Airport (Hartford, CT; airport code) |
| HFD | Hulbert Financial Digest (newsletter) |
| HFD | Heat Field Deformation |
| HFD | Haut Fonctionnaire de Défense (French: Senior Official for Defense) |
| HFD | Hike for Discovery (Leukemia & Lymphoma Society) |
| HFD | Human Factors Division (US DHS) |
| HFD | Happy Father's Day |
| HFD | Housing Front Desk (Stanford University; Palo Alto, CA) |
| HFD | Half Duplex |
| HFD | Happy Friends Day |
| HFD | Haut Fonctionnaire de Défense et de Sécurité (French: Senior Defense and Security Official) |
| HFD | Hrvatsko Farmaceutsko Društvo (Croatian Pharmaceutical Society) |
| HFD | Hazard Fragmentation Distance (explosives) |
| HFD | Have Fun Dying (band) |
| HFD | Health Food Drink |
| HFD | Hays Fire Department (KS, USA) |
| HFD | Heat Flux Dropout |
| HFD | Hartsdale Fire Department (New York) |
| HFD | Hela Fass Dooo (automotive enthusiast group) |
| HFD | Harvest Fire Discipleship |
| HFD | Henrietta Fire District (New York) |
| HFD | Horse Heads Fire Department (New York) |
| HFD | HSA (Health Savings Account) Funding Distribution (IRS) |
| HFD | Hantsport Fire Department (Nova Scotia, Canada) |
| HFD | Hardwood Flooring Distributors, Inc. (Seattle, WA) |