ATCA

ATCA may refer to:


 * Atça, a town in Turkey
 * Advanced Telecommunications Computing Architecture, a specification for communications equipment
 * Aid to the civil authority, military aid to the civil power
 * Alien Tort Claims Act, a U.S. statue on jurisdiction
 * All Tripura Chess Association, an Indian organisation
 * American Theatre Critics Association
 * Association of Turkish Cypriots Abroad
 * Australia Telescope Compact Array, a radio telescope in New South Wales