Ust-Tarksky District (Russian: Усть-Та́ркский райо́н) is an administrative[1] and municipal[4] district (raion), one of the thirty in Novosibirsk Oblast, Russia.

The area of the district is 4,061 square kilometers (1,568 sq mi).

[2] Its administrative center is the rural locality (a selo) of Ust-Tarka.

[3] Ust-Tarksky District is located in the Baraba Lowland.

The largest river in the district is the Om, and Lake Uguy, by Uguy village, is the largest lake.