| EFO | Economic and Fiscal Outlook 
| Others |
| EFO | Eddie Forman Orchestra
| Others |
| EFO | Eddie from Ohio
| Others |
| EFO | Educational Foundation of Orinda
| Others |
| EFO | Educational Freedom Organization
| Others |
| EFO | Efficient Fiber Optics
| Others |
| EFO | Egg Farmers of Ontario
| Others |
| EFO | Electronic Flame-Off
| Others |
| EFO | Emergency Flow Order
| Others |
| EFO | Emergency Flow Orders
| Others |
| EFO | Emmett Furla Oasis
| Others |
| EFO | Empty False Obstacle
| Others |
| EFO | Engineering Faculty Organization
| Others |
| EFO | Engineers Foundation of Ohio
| Others |
| EFO | Entry Form Optimization
| Others |
| EFO | Environmental Federation of Oklahoma
| Others |
| EFO | Environmental Field Office
| Others |
| EFO | Environmental Field Offices
| Others |
| EFO | Error, Freak, and Oddity
| Others |
| EFO | Errors Freaks And Oddities
| Others |
| EFO | Essentials of Franchise Operations
| Others |
| EFO | Estonian Folk Orchestra
| Others |
| EFO | European Federation of Osteopaths
| Others |
| EFO | Excess Fare Office
| Others |
| EFO | Executive Fire Officer
| Others |
| EFO | Executive Fire Officers
| Others |
| EFO | Experimental Factor Ontology
| Others |
| EFO | Furniture Outlet
| Others |