'''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 * Ciliary transition zone, a portion of the motility structure known as cilium present in eukaryotic cells. * Central Time Zone * Count trailing zeros, a computer programming bit operation {{disambig}}