Lyambirsky District (; , Lämbiŕbuje; , Lämbireń ajmak; , Lämberä rayonı) is an administrativeConstitution of the Republic of Mordovia, Article 63 and municipalLaw #122-Z district (raion), one of the twenty-two in the Republic of Mordovia, Russia. It is located in the northern and central parts of the republic. The area of the district is . Its administrative center is the rural locality (a selo) of Lyambir.Law #7-Z As of the 2010 Census, the total population of the district was 34,142, with the population of Lyambir accounting for 24.8% of that number.
