HSFO
| Acronym | Definition |
|---|---|
| HSFO | Heart and Stroke Foundation of Ontario (Toronto, Ontario, Canada) |
| HSFO | High Sulphur Furnace Oil |
| HSFO | High Sulfur Fuel Oil (refining) |
| HSFO | Human Services Finance Officers (Washington, DC) |
| HSFO | Healthy Start Field Office (University of California, Davis) |