ZT may refer to:

Arts and entertainment:

• Zero Tolerance (game), a 1994 video game for Sega Genesis console
• The Zimmer Twins, a Canadian animated series and website
• Zoo Tycoon (series), a video game series
  • Zoo Tycoon, the first game in the series

Science and technology:

• Zeitgeber time, an indication of circadian rhythm cycle time
• Zettatesla, an SI unit of magnetic flux density
• Zolpidem Tartrate, a popular prescription sleep medication commonly known by the brand name Ambien
• zT, a figure of merit for the maximum energy conversion efficiency of thermoelectric materials

Other uses:

• Zero Two, a Darling in the Franxx character.
• MG ZT, an executive car made by MG Rover
• Zero tolerance, a non-discretionary rules enforcement policy
• Zero Tolerance Knives, a knife brand from Kai USA
• Zero-turn mower, a type of lawn mowing equipment
• ZT, IATA code for Titan Airways