The Mongolian People's Party (MPP) is a social democratic political party in Mongolia. It was founded as a communist party in 1920 by Mongolian revolutionaries and is the oldest political party in Mongolia. The party played an important role in the Mongolian Revolution of 1921, which was inspired by the Bolsheviks' October Revolution. Following independence, it governed Mongolia as a one-party socialist state. The party changed its name to the Mongolian People's Revolutionary Party (MPRP) and joined the Communist International in 1924 and served as a sole-ruling party of the Mongolian People's Republic.

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".