Ust-Maysky District (Russian: Усть-Ма́йский улу́с; Yakut: Уус-Маайа улууһа, Uus-Maaya uluuha, [uːs-maːja uluːha]) is an administrative[1] and municipal[6] district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia.

The area of the district is 95,300 square kilometers (36,800 sq mi).

[4] The main rivers in the district are the Aldan and its tributaries the Maya and Allakh-Yun.

As of the 2021 Census, the ethnic composition was as follows:[11] The economy of the district is mostly based on mining, timber industry, and production of construction materials.

[2] There are deposits of gold, lead, zinc, rare metals, and construction materials.