• Extreme Championship Wrestling (formerly Eastern Championship Wrestling), a professional wrestling promotion that operated from 1992 to 2001
• ECW on TNN, a professional wrestling television program produced by the original promotion from 1999 to 2000
• The Alliance (professional wrestling) (originally the WCW/ECW Alliance), a 2001 World Wrestling Federation stable that included Extreme Championship Wrestling
• ECW (WWE), a World Wrestling Entertainment brand and television program 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 Press, a Canadian book publisher

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.