The Ulkayak (Kazakh: Өлкейек; Russian: улькаяк) is a river in Kazakhstan.

[1] It is one of the rivers of the southern part of the Turgay Depression, belonging to the Irgyz -Turgay ecoregion.

[4][5] The Ulkayak is formed at the confluence of rivers Zhantai (Жантай) and Tolybai (Толыбай).

Towards its last stretch its valley widens and the river meanders heading roughly southwards.

The river freezes yearly between early November and late March.