Lensky District (Russian: Ле́нский улу́с; Yakut: Лиэнскэй улууһа, Lienskey uluuha) 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 77,000 square kilometers (30,000 sq mi).

[3] The main river in the district is the Lena with its tributaries the Vitim, Peleduy, Derba and Nyuya.

[2] Within the framework of administrative divisions, Lensky District is one of the thirty-four in the republic.

*Administrative centers are shown in bold The economy of the district is mostly based on timber industry, production of construction materials, and food industry.