| Acronym | Definition |
|---|
| EFO | Experimental Factor Ontology (software) |
| EFO | Executive Fire Officer |
| EFO | Étoile Filante de Ouagadougou (Burkinabé football club) |
| EFO | Eddie from Ohio (Virginia pop folk band) |
| EFO | Educational Foundation of Orinda (Ordina, CA) |
| EFO | Electronic Flame Off |
| EFO | European Federation of Osteopaths |
| EFO | Établissements Français d'Océanie (French: French Settlements in Oceania) |
| EFO | Exception to Fair Opportunity |
| EFO | Errors Freaks and Oddities (philately) |
| EFO | Efficient Fiber Optics |
| EFO | Electronic Financial Officer |
| EFO | Earnings from Operations |
| EFO | Enabled, then Firing Once (STRPN transition) |
| EFO | Egg Farmers of Ontario (Mississauga, ON) |
| EFO | Emergency Field Office |
| EFO | Exponential Financial Options (South Africa) |
| EFO | Equivalent Field Office |
| EFO | Executive Financial Officer |
| EFO | Energy for Opportunity (Canada; est. 2008) |
| EFO | Experience Factory Organization (software development) |
| EFO | Executive Field Operations (Indian IT companies) |