Tyuntyugur (Kazakh: Тімтуір; Russian: Тюнтюгур) is a lake in the Kostanay Region, Kazakhstan.

[1] Tyuntyugur is a steppe lake of the central sector of the Turgay Basin in Karasu District, Kostanay Region.

[2][1] The eastern shore of lake Tyuntyugur is bound by about 4.5 meters (15 ft) high cliffs, while the southern coastline is flat and muddy.

It is a critical site for nesting, migration and molting of 39 waterfowl and wetland bird species, such as the greylag goose, mallard, gadwall, garganey, common pochard, tufted duck and Eurasian coot.

[5] 13 species of birds that visit the lake are listed as critically endangered, such as the siberian crane and the gyrfalcon.