Vilyuysky District (Russian: Вилю́йский улу́с; Yakut: Бүлүү улууһа, romanized: Bülüü uluuha, [bylyː 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 55,200 square kilometers (21,300 sq mi).

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

[4] Main rivers in the district include the Vilyuy and its tributaries the Tyung and Chybyda, as well as the Tympylykan and Lungkha tributaries of the Lena.

[2] As of the 2021 Census, the ethnic composition was as follows:[12] The economy of the district is mostly based on agriculture.