Tiachiv (Ukrainian: Тячів, IPA: [ˈtʲɑtʃiu̯]; Rusyn: Тячово; Hungarian: Técső; Yiddish: טעטש, romanized: Tetsh) is a city located on the Tisza River in Zakarpattia Oblast (region) in western Ukraine.

[1] There are several alternative names used for this city: In the year 1211, the town was mentioned for the first time as Tecu.

In 1939, following the annexation of the whole of Carpathian Ruthenia, the city became again part of Hungary until the end of World War II.

[citation needed] The settlement reached a peak of 1,000 Jewish inhabitants by the year 1940.

2001 census In 2001, the population of the Tiachiv region included mainly Ukrainians (83.2%), followed by Romanians (12.4%).