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

[1] The flag of the republic according to the Article 112 of the constitution was a red cloth with golden inscriptions: "РСФСР" and "Марийская АССР".

[2] The Provisions on the State flag of the Mari Autonomous Soviet Socialist Republic was approved by the Decree of the Presidium of the Supreme Council of the Mari ASSR of February 6, 1956.

[2] A new version of the flag was described in the Article 158 of the Constitution of the Mari ASSR, approved by the extraordinary IX session of the Supreme Council of the Republic of the IX convocation on May 27, 1978.

The flag had the name of the republic in the Mari language added - "Марий АССР".