Keylong (or Kyelong or Kyelang) is the administrative centre of the Lahaul and Spiti district in the Indian state of Himachal Pradesh, some 120 kilometres from the Indo-Tibetan border.
Keylong is at an altitude of 3,080 meters metres (10,104 feet). It is cut off from the outside world from November to April, due to heavy snowfall at Rohtang Pass. It faces the famous Kardang Monastery, the largest and most important monastery in Lahaul, of the Drukpa sect of Tibetan Buddhism, which is on a slope across the river from Keylong.
Keylong is located along the Manali–Leh road, about 7 km north east of intersection of the Chandra Valley, the Bhaga Valley, and the Chenab Valley; on the banks of Bhaga River. Sights near Keylong include the Kardang, Shasur, and Tayul monasteries, all within a few kilometres of Keylong. There is also a small temple dedicated to the local deity Kelang Wazir in the house of Sh. Nawang Dorje which may be visited upon arrangement.
Keylong is the district headquarters of Lahaul and Spiti and is home to most of the government offices and facilities in Lahaul, and also hosts a regular bazaar.
There are some tourist facilities including a Circuit House, a P.W.D. (Public Works Department) Rest House, a Sainik Rest House, a Tourist Bungalow, and a number of small hotels.
The annual Lahaul Festival is held here each July with a big, busy market and a number of cultural activities.