Upper Mustang is a medieval walled city and Village Development Committee in Mustang District in the Dhaulagiri Zone of northern Nepal. At the time of the 1991 Nepal census it had a population of 876 people living in 178 individual households.

On the Tibetan Plateau north of the main Himalayas range, Mustang served as the capital of the ancient Kingdom of Mustang, which survives as the Kingdom of Lo (or "Upper Mustang" (the northern two-thirds of the present-day Mustang District.)) Mustang was founded in 1380 by Ame Pal, who oversaw construction of the city wall and many of the still-standing structures in the early 15th century. The monarchy officially ceased to exist on October 7, 2008 by Nepali Government order. The last king (raja or gyelpo) is Jigme Dorje Palbar Bista (born c. 1933), in the direct line of the historic monarchy dating back 25 generations to 1380. The population includes ethnic Lhobas.

The village is noted for its tall white washed mud brick walls, gompas and the Raja's or Royal or King's Palace, a nine-cornered, five story structures built around 1400. There are four major temples: Jampa Lhakhang or Jampa Gompa, the oldest, built in the early 15th century and also known as the "God house"; Thubchen Gompa, a huge, red assembly hall and gompa built in the late 15th century and located just southwest of Jampa Gompa; Chodey Gompa, now the main city gompa; and the Choprang Gompa, which is popularly known as the "New Gompa".

Even though foreign visitors have been allowed in the kingdom since 1992, tourism to Upper Mustang remains limited.