Mongolia–Russia relations have been traditionally strong since the Communist era, when the Soviet Union supported the Mongolian People's Republic. Mongolia and Russia remain allies in the post-communist era. Russia has an embassy in Ulaanbaatar and two consulates general. Mongolia has an embassy in Moscow, three consulates general, and a branch in Yekaterinburg. Both countries are full members of the Organization for Security and Co-operation in Europe.

The Mongolian Revolution of 1921 was a military and political event by which Mongolian revolutionaries, with the assistance of the Soviet Red Army, expelled Russian White Guards from the country, and founded the Mongolian People's Republic in 1924. Although nominally independent, the Mongolian People's Republic was a satellite state of the Soviet Union until the third Mongolian revolution in January 1990. The revolution also ended the Chinese Beiyang government's occupation of Mongolia, which had begun in 1919. The official Mongolian name of the revolution is "People's Revolution of 1921" or simply "People's Revolution".