TZ or tz may refer to:
The tz database is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems.
The Hebrew noun tzaraath (Hebrew צרעת [tsaˈʁaʕat], Romanized Tiberian Hebrew ṣāraʻaṯ and numerous variants of English transliteration, including saraath, tzaraas, tzaraat, tsaraas and tsaraat) describes disfigurative conditions of the skin, hair of the beard and head, clothing made of linen or wool, or stones of homes located in the land of Israel.
Tziporah Malka "Tzipi" Livni (Hebrew: ציפורה מלכה "ציפי" לבני; pronounced [tsipoˈʁa malˈka ˈtsipi ˈlivni] born 8 July 1958) is a prominent Israeli politician and former Foreign Minister of Israel.
Tzotzil (; Bats'i k'op [ɓatsʼi kʼopʰ]) is a Maya language spoken by the indigenous Tzotzil Maya people in the Mexican state of Chiapas.
Tzeltal or Ts'eltal () is a Mayan language spoken in the Mexican state of Chiapas, mostly in the municipalities of Ocosingo, Altamirano, Huixtán, Tenejapa, Yajalón, Chanal, Sitalá, Amatenango del Valle, Socoltenango, Villa las Rosas, Chilón, San Juan Cancun, San Cristóbal de las Casas and Oxchuc.