ACK

ACK or Ack may refer to:

• Amar Chitra Katha, an Indian comic book series

• Armstrong Whitworth F.K.8, an early aircraft known as the "Big Ack"
• IATA airport code for Nantucket Memorial Airport in State of Massachusetts, USA
• Nantucket Airlines or ACK Air, an American airline

• Acknowledgement (data networks)
  • ACK (TCP), the control character used in the Transmission Control Protocol to acknowledge receipt of a packet
• Amsterdam Compiler Kit, a retargetable compiler suite and toolchain
• ack, a grep-like source code search tool

• Acklington railway station (Station code: ACK), a rail station in the UK

• Aka-Kora language (ISO 639-3: ack), an extinct Great Andamanese language
• Assumption College, Kilmore, an Australian school
• TNK2 or ACK or ACK1, an enzyme that in humans is encoded by the TNK2 gene

• Ack Ack (disambiguation)
• Acknowledgment (disambiguation)