The Stalinist repressions in Mongolia (Mongolian: Их Хэлмэгдүүлэлт, Ikh Khelmegdüülelt, "Great Repression") refers to a period of heightened political violence and persecution in the Mongolian People's Republic between 1937 and 1939. The repressions were part of the Stalinist purges (also known as the Great Purge) unfolding across the Soviet Union around the same period. Soviet NKVD advisors, under the nominal direction of Mongolia's de facto leader Khorloogiin Choibalsan, persecuted individuals and organizations perceived as threats to the Mongolian revolution and the growing Soviet influence in the country. As in the Soviet Union, methods of repression included show trials, torture, and imprisonment in remote forced labor camps. Estimates differ, but anywhere between 20,000 to 35,000 "enemies of the revolution" were executed, a figure representing three to five percent of Mongolia's total population at the time. Victims included those suspected of espousing lamaism, pan-Mongolist nationalism, and pro-Japanese sentiment with the Buddhist clergy, aristocrats, intelligentsia, political dissidents, and ethnic Buryats and Kazakhs suffering the greatest losses.
By the time the purges ended in early 1939, an entire stratum of Mongolian society had effectively been exterminated while much of Mongolia's cultural heritage lay in ruins. Approximately 18,000 lamas were condemned to death while thousands more were forcibly laicized and conscripted into the Mongolian army. More than 700 Buddhist monasteries were destroyed. The old guard revolutionary class, viewed as heavily nationalist, was eliminated; twenty five persons from top positions in the party and government were executed (including former prime ministers Peljidiin Genden and Anandyn Amar), 187 from the military leadership, and 36 of the 51 members of the Central Committee. Choibalsan became Mongolia's unquestioned leader backed by Soviet advisors and a growing Red Army presence in the country and supported by younger apparatchiks who were more closely aligned with the Soviet Union, such as future leader Yumjaagiin Tsedenbal.