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ACK or Ack may refer to:


  • Andrew Haldane (1917–1944), known as Andy and nicknamed "Ack-Ack", an officer in the United States Marine Corps in the Pacific Theatre during World War II and "one of the most revered figures in the history of the U.S. Marines

Arts, entertainment, and media[edit]

Computing and technology[edit]

Organizations and institutions[edit]


Other uses[edit]

  • ACK or Aka-Kora language, an extinct Great Andamanese language
  • ACK or ACK1, a synonym for TNK2, an enzyme that in humans is encoded by the TNK2 gene
  • "Ack ack", from signalese for AA, referring to anti-aircraft artillery fire

See also[edit]