Tiachiv Raion (Ukrainian: Тячівський район, Romanian: Raionul Teceu, Hungarian: Técsői járás) is a raion in Zakarpattia Oblast in western Ukraine.

[3][4] According to the 2001 census, the majority of the population of the Teceu district spoke Ukrainian (83.52%), with Romanian (12.45%), Hungarian (2.76%) and Russian (1.06%) speakers in the minority.

[6] Romanian became in September 2012 a regional language in the village of Bila Tserkva; meaning it was allowed to be used in the towns administrative office work and documents.

[7] The Constitutional Court of Ukraine on 28 February 2018 ruled this legislation unconstitutional.

[8] The raion has one city: Tiachiv, and five urban-type settlements: Bushtyno, Dubove, Solotvyno, Teresva and Ust-Chorna.