| EFO | Earnings from Operations | 运营收入 |
| EFO | Electronic Flame-Off | 电子火焰关闭 |
| EFO | Equivalent Field Office | 等效现场办公室 |
| EFO | Errors Freaks and Oddities (philately) | 错误怪异（集邮） |
| EFO | Executive Fire Officer | 执行消防官 |
| EFO | Eddie from Ohio (Virginia pop folk band) | 来自俄亥俄州的埃迪（弗吉尼亚流行民谣乐队） |
| EFO | Egg Farmers of Ontario (Mississauga, ON) | 安大略省蛋农（密西沙加，安大略） |
| EFO | Error Freak And Oddity | 错误怪异 |
| EFO | Executive Field Operations (Indian IT companies) | 执行现场运营（印度IT公司） |
| EFO | Emergency Field Office | 应急现场办公室 |
| EFO | Experience Factory Organization (software development) | 体验工厂组织（软件开发） |
| EFO | Efficient Fiber Optics | 高效光纤 |
| EFO | Enabled, then Firing Once (STRPN transition) | 启用，然后触发一次（STRPN转换） |