| EFW | Electric Fusion Welding | 电熔焊 |
| EFW | Emergency Feedwater | 应急给水 |
| EFW | Exercise First Wave (NATO simulation exercise) | 演习第一波（北约模拟演习） |
| EFW | Elbit-Fort Worth (Elbit Systems Ltd) | Elbit Fort Worth（Elbit系统有限公司） |
| EFW | Estimated Fetal Weight | 估计胎儿体重 |
| EFW | Jefferson, Iowa USA | 美国爱荷华州杰斐逊 |
| EFW | Evanescent Floquet Wave | 消逝Floquet波 |
| EFW | Electric Field and Wave Experiment (Cluster spacecraft) | 电场与波实验（集群航天器） |
| EFW | Exponential Forgetting Window (signal processing) | 指数遗忘窗口（信号处理） |
| EFW | Energy From Waste | 废物能源 |
| EFW | Electric Fusion Welded (pipe) | 电熔焊（管道） |