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CTZ may refer to:

  • Chemoreceptor trigger zone in neuroscience
  • CTZ is the ICAO airline designator for CATA Línea Aérea, Argentina
  • CTZ is the IATA airport code for Sampson County Airport, United States
  • CTZ is the United States Federal Aviation Administration location identifier for Sampson County Airport
  • Chelyabinsk Tractor Plant, Russia
  • cyclothiazide, a positive allosteric modulator of the AMPA receptor
  • Combat Tactical Zone
  • Central Time Zone
  • Count trailing zeros, a computer programming bit operation