Lehis one of the two districts located in Ladakh, the other being the Kargil District to the west, in the state of Jammu and Kashmir, India.It is the largest district in India in terms of area. It is bounded on the north by Ghanche District (Northern Areas), a small border with Xinjiang, China, via the Karakoram Pass which is part of the district. Aksai Chin and Tibet is to the east. Kargil district to the west, and lahul and spiti to the south. The district headquarters is based in Leh. It lies between 32 to 36 degree North latitude and 75 to 80 degree East longitude. As of 2001 the district has a population of 117,637.

The whole of Ladakh was under the administration of Leh district until July 1, 1979, when Kargil district was bifurcated from Leh district. According to the 2001 census 48% of the district population are followers of Tibetan Buddhism and Bon , 46% being Muslims, the majority followers of Shi'a Islam, and the rest being Sunni and Nurbakhshi Muslims. Hindus make up 6% of the population. Religion has been the source of grievances between Buddhists and Muslims since the late 20th century.