Erzinsky District (; , Erzin kojuun) is an administrative and municipal district (raion, or kozhuun), one of the seventeen in the Tuva Republic, Russia. It is located in the south and southeast of the republic. The area of the district is . Its administrative center is the rural locality (a selo) of Erzin. As of the 2010 Census, the total population of the district was 8,280, with the population of Erzin accounting for 38.5% of that number.
The district was first established on July 28, 1941. On January 7, 1963, it was abolished and merged into Tes-Khemsky District. Erzinsky District was re-established on January 12, 1965.