Tetyushsky District (Russian: Тетю́шский райо́н; Tatar: Тәтеш районы) – is a territorial administrative unit and municipal district of the Republic of Tatarstan within the Russian Federation. The district is located in the south-west of Tatarstan, on the right bank of the Kuybyshev Reservoir, and shares borders with the Ulyanovsk Oblast, Buinsky, Apastovsky and Kamsko-Ustyinsky District. The administrative center of the district is the city of Tetyushi.