| Acronym | Definition |
|---|
| ECW | Extreme Championship Wrestling |
| ECW | Episcopal Church Women |
| ECW | Eastern Championship Wrestling (formerly Extreme Championship Wrestling) |
| ECW | English Civil War |
| ECW | Entente Cycliste de Wallonie (Belgian cycling club) |
| ECW | eClinicalWorks (medical software; Westborough, MA) |
| ECW | Extreme Cold Weather |
| ECW | Enhanced Compressed Wavelet |
| ECW | Enhanced Compressed Wavelet (Image compression format created by Earth Resource Mapping) |
| ECW | Extracellular Water |
| ECW | Electronic Control Weapon (law enforcement) |
| ECW | Entertainment Culture Writing (publisher) |
| ECW | Emergency Conservation Work act |
| ECW | End Corporate Welfare (Longwood, FL) |
| ECW | Electronic Combat Wing |
| ECW | Enameled Copper Wire |
| ECW | Extraction Configuration Wizard |
| ECW | Elliptical Cylindrical Waveguide |
| ECW | Effluent Cooling Water |
| ECW | Electronic Commerce World (magazine) |
| ECW | Elite Crimson Warriors (gaming clan) |