Srednekolymsky District (Russian: Среднеколы́мский улу́с; Yakut: Орто Халыма улууһа, Orto Xalıma uluuha, [oɾto xalɯma uluːha]) is an administrative[1] and municipal[5] district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia.

The area of the district is 125,200 square kilometers (48,300 sq mi).

[3] Its administrative center is the town of Srednekolymsk.

The main rivers in the district include the Kolyma, the Alazeya and the Rossokha with the Arga-Yuryakh.

[2] As of the 2021 Census, the ethnic composition was as follows:[11] The economy of the district is mostly based on grazing-based animal husbandry, including reindeer, horse and cattle industries.