ECW

ECW may refer to:

Professional wrestling

 * Extreme Championship Wrestling (originally Eastern Championship Wrestling), a professional wrestling promotion that operated from 1992 to 2001
 * The Alliance (professional wrestling) (originally the WCW/ECW Alliance), a 2001 World Wrestling Federation stable that included Extreme Championship Wrestling
 * ECW (WWE brand), a World Wrestling Entertainment brand from 2006 to 2010 based on the Extreme Championship Wrestling promotion

Wrestling television programs

 * ECW Hardcore TV, produced by the Extreme Championship Wrestling promotion from 1993 until 2000
 * ECW on TNN, produced by the Extreme Championship Wrestling promotion from 1999 to 2000
 * WWE ECW, produced by World Wrestling Entertainment from 2006 to 2010 based on the Extreme Championship Wrestling promotion

Military

 * Electronic counter-warfare, a set of military measures to counteract enemy radars, missile-guidance, etc.
 * English Civil War(s), a series of armed conflicts and political machinations which occurred in England from 1642 to 1651

Other

 * Eastern Coach Works, a defunct bus body building company from England
 * ECW (file format), an enhanced compressed wavelet file format designed for geospatial imagery
 * ECW model in chemistry for Lewis acid–Lewis base interactions
 * ECW Press, a Canadian book publisher
 * Extreme Cold Warnings are issued to inform the public about active or imminent severe cold temperatures in their region that are expected to last for a while; examples:
 * In the U.S., when temperatures fall to -35 F or colder with winds of less than 5 mph
 * In Canada, based on either the temperature or the wind chill being a certain value for at least 2 hours; the values range from -30 C in the warm temperates to -55 C in parts of the Arctic
 * Extreme Cold Weather clothing for arctic or mountainous areas
 * Extended Cold Weather Clothing System worn by members of the United States Army