Ack Ack commonly refers to the artillery fire of anti-aircraft warfare, derived from the initials "AA".

Ack Ack or Ack-Ack may also refer to:

• Ack Ack (horse), American Hall of Fame racehorse
  • Ack Ack Handicap (Hollywood Park), a former horse race held at Hollywood Park named for the racehorse
  • Ack Ack Stakes, a horse race held at Churchill Downs named for the racehorse
• Ack-Ack Macaque, a science fiction novel by English writer Gareth L. Powell
• Andrew Haldane, nicknamed "Ack-Ack", captain in the United States Marine Corps during World War II

• All pages with titles containing Ack Ack

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