Lyambirsky District (Russian: Ля́мбирский райо́н; Erzya: Лямбирьбуе, Lämbiŕbuje; Moksha: Лямбирень аймак, Lämbireń ajmak; Tatar: Ләмберә районы, Lämberä rayonı) is an administrative[1] and municipal[5] district (raion), one of the twenty-two in the Republic of Mordovia, Russia.

The area of the district is 852 square kilometers (329 sq mi).

[3] Its administrative center is the rural locality (a selo) of Lyambir.

[4] Within the framework of administrative divisions, Lyambirsky District is one of the twenty-two in the republic.

[1] The district is divided into sixteen selsoviets which comprise seventy rural localities.