ATCA or Atca may refer to:
- Advanced Telecommunications Computing Architecture, a series of specifications by the PCI Industrial Computer Manufacturers Group
- The Turkish town of Atça
- The Alien Tort Claims Act, a United States law which provides redress for violations of customary international law. Also known as the Alien Tort Statute.
- The Australia Telescope Compact Array, a radio telescope at the Paul Wild Observatory, twenty five kilometres (16 mi) west of the town of Narrabri in Australia.
This disambiguation page lists articles associated with the title Atca.
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