ACK

ACK or Ack may refer to:

Arts and entertainment

 * Amar Chitra Katha, an Indian comic book series

Technology

 * 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

Transportation

 * Acklington railway station (Station code: ACK), a rail station in the UK
 * Armstrong Whitworth F.K.8, an early aircraft known as the "Big Ack"
 * Nantucket Airlines or ACK Air, an American airline
 * Nantucket Memorial Airport (IATA: ACK, FAA LID: ACK), an airport in the US

Other uses

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