Miyun District () is situated in northeast Beijing. It has an area of and a population of 527,683 (2020 Census). Its government seat is located in Gulou Subdistrict.
Miyun was one of the places where Warlord Feng Yuxiang stationed his troops in preparation of the Beijing Coup of 1924. In the 1930s, Miyun District was occupied by the Imperial Japanese Army and became part of the area controlled by the East Hebei Autonomous Council, a puppet state of Japan. The Japanese occupation was challenged, however, when a local Taoist priest managed to incite Miyun's peasantry. As member of the Yellow Sand Society, he garnered followers and convinced them that they could become immune to gunfire through magical rituals that he performed. Thus highly motivated, the peasants launched a rebellion in July 1936 and defeated an East Hebei Army unit that was sent to suppress them. Nearby Imperial Japanese Army forces were consequently mobilized against the insurgents. By September, the uprising was defeated and about 300 of Miyun's Yellow Sand rebels had been killed or wounded in the fighting.
There are 2 subdistricts, 17 towns, and 1 ethnic township in the district. The government seat of Miyun District is located in Gulou Subdistrict.
Miyun contains the easternmost point of Beijing Municipality, bordering the Beijing districts of Pinggu to the southeast, Shunyi to the southwest and Huairou to the west as well as Hebei province to the due north and east. The Miyun Reservoir, a major source of water for the Beijing Municipality, is also located in Miyun District.
Miyun District has a humid continental climate (Köppen climate classification Dwa). The average annual temperature in Miyun is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around .
A popular tourist attraction in Miyun district is Simatai, a section of the Great Wall. Another is Nanshan Ski Resort, one of the largest in the country.