The Mordovian Okrug (Russian: Мордовский округ) was an okrug (an administrative unit) in the Soviet Union created to establish the autonomy for Mordovians.
[1] It was based on the areas of Penza and Simbirsk Governorates of RSFSR with significant Mordovian population.
According to the 1926 Soviet census, these governorates had population of 1,328,441 persons, of which 32.2% were Mordovians, 63.2% were Russians and 4.5% were Tatars.
[1] The Okrug was subdivided into the following 23 districts (raions): Ардатовский, Атяшевский, Ачадовский, Беднодемьяновский, Дубенский, Ельниковский, Зубово-Полянский, Инсарский, Краснослободский, Ковылкинский, Кочкуровский, Козловский, Наровчатский, Ромодановский, Рузаевский, Рыбкинский, Саранский, Старошайговский, Талызинский, Темниковский, Теньгушевский, Торбеевский, Чамзинский.
[1] The Mordovian Okrug was elevated to the status of an autonomous oblast becoming the Mordovian Autonomous Oblast [ru] on 10 January 1930.