The flag of the Mordovian Autonomous Soviet Socialist Republic was adopted in 1954 by the government of the Mordovian Autonomous Soviet Socialist Republic.

[1] The state flag of the Mordovian ASSR consisting of a red or scarlet cloth, in the upper left-hand corner there is a golden sickle and a hammer placed crosswise with the arms downwards.

Above the hammer and sickle inscription in gold letters "MASSR".

The inscription on the upper right corner of the flag: “Proletarians of all countries, unite!” In Moksha, Erzya and Russian.

[3] On 7 December 1990, the government of the Mordovian ASSR adopted the Declaration on the Legal Status of the Mordovia, which changed the status of the republic from an ASSR to an SSR.