| Acronym | Definition |
|---|
| HFO➣Heavy Fuel Oil |
| HFO➣Haas Factory Outlet (machine tool distributor; Twinsburg, OH) |
| HFO➣High Frequency Oscillator |
| HFO➣Hole Full of Oil (oil exploration slang) |
| HFO➣Hydrofluoro-Olefin (refrigerant) |
| HFO➣Health Force Ontario (Canada) |
| HFO➣Honolulu Forecast Office (National Weather Service; Hawaii) |
| HFO➣Heavy Furnace Oil |