| Abbreviation | Definition |
|---|---|
| HFA | Health For All |
| HFA | High Functioning Autism |
| HFA | Harry Fox Agency |
| HFA | Humanities and Fine Arts |
| HFA | HydroFluoroAlkane-134a |
| HFA | High Frequency Accelerometer |
| HFAK | Hollow-fiber Artificial Kidney |
| HFB | Human Fetal Brain |
| HFC | HydroFluoroCarbon |
| HFC | Hydraulic Flight Control |
| HFC | Heat Flow and Convection |
| HFC | Housing Financing Company |
| HFCL | Himachal Futuristic Communications Limited |
| HFCT | Hydraulic Flight Control Test |
| HFCV | Helium Flow Control Valve |
| HFDK | Human Fetal Diploid Kidney |
| HFDS | Hydrogen Fluid Distribution System |
| HFE | High Frequency Executive |
| HFEA | Human Fertilisation Embryology Authority |
| HFFD | Highland Falls Fire Department |
| HFLL | Hawaii Family Leave Law |
| HFM | Hand, Foot, and Mouth Disease |
| HFM | Hollow Fiber Membrane |
| HFMU | High Fidelity Mockup |
| HFO | Hafnium Oxide |
| HFO | High Frequency oscillator |
| HFO | Harrisburg Field Office |
| HFS | Hardware Functionality Scan |
| HFS | Horizontal Flight Simulator |
| HFS | Hectare Furrow Slice |
| HFS | Hierarchical File System |
| HFT | Horizontal Flight Test |
| HFTF | Horizontal Flight Test Facility |
| HFTS | Horizontal Flight Test Simulator |
| HFU | Heater Firing Unit |
| HFX | High Frequency Transceiver |
| HG | Human Geography |
| HG | Mercury |
| HG | Hunting And Gathering |
| HG | Helicopter Guy |
| HG | Home Gateway |
| HG | Hitchhiker Goddard Mission |
| HGA | High Gain Antenna |
| HGAS | High Gain Antenna System |
| HGDS | Hazardous Gas Detection System |
| HGF | Hepatic Growth Factor |
| HGH | Human Growth Hormone |
| HGLDS | Hazardous Gas Leak Detection Subsystem |
| HGM | Human Gastric Mucin |
| HGS | Hydrogen Gas Saver |