| 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) |