Tat or TAT may refer to:
Tat people of Iran (Tati: Irünə Tâtün, ایرون تاتون) are an Iranian people living in northern Iran, especially in the south of Qazvin province. They are a subgroup of the Persians.
Tats of Iran use the Tati language (Iran), is a group of northwestern Iranian dialects which are closely related to the Talysh language. Persian and Azerbaijani are also spoken. Tats of Iran are mainly Zoroastrian, Jewish and Muslims and about 300,000 population.
Starting from the Middle Ages, the term Tati was used not only for the Caucasus but also for north-western Iran, where it was extended to almost all of the local Iranian languages except of Persian and Kurdish.
Currently, the term Tati and Tati language is used to refer to a particular group of north-western Iranian dialects (Chali, Danesfani, Hiaraji, Hoznini, Esfarvarini, Takestani, Sagzabadi, Ebrahimabadi, Eshtehardi, Hoini, Kajali, Shahroudi, Harzani) in Iranian Azerbaijan, as well as south of it in the provinces of Qazvin and Zanjan. These dialects have a certain affinity to the Talysh language as one of the descendants of the Old Azari language.
The Tat people (also: Tati, Parsi, Daghli, Lohijon, Caucasian Persians, Transcaucasian Persians) are an Iranian and ethnic Persian people, presently living within Azerbaijan, Armenia, Georgia, and Russia (mainly Southern Dagestan). The Tats are part of the indigenous peoples of Iranian origin in the Caucasus.
Tats use the Tat language, a southwestern Iranian language and a variety of Persian.Azerbaijani and Russian are also spoken. Tats are mainly Shia Muslims, with a significant Sunni Muslim minority.
As late as the turn of the 20th century, the Tat constituted about 11% of the population of the entire eastern half of Azerbaijan (see Baku Governorate, section on Demography). They formed nearly one-fifth (18.9%) of the population of the Baku province and over one-quarter (25.3%) of the Kuba Province—both on the Caspian Sea. Either through misrepresentation, data manipulation or simple assimilation, the Tat portion of the population of Azerbaijan has shrunk to insignificance, facing assimilation.