| Altai District | |
| Native Name: | Алтай сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Pushpin Map: | Mongolia |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Mongolia |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Bayan-Ölgii Province |
| Unit Pref: | Imperial |
| Area Total Km2: | 3163.56 |
| Population As Of: | 2014 |
| Population Total: | 3983 |
| Timezone: | UTC+7 |
| Coordinates: | 48.3022°N 89.5153°W |
Altai (Mongolian: Алтай) is a sum (district) of Bayan-Ölgii Province in western Mongolia. As of 2014 it had a population of 3983 people.[1]
Altai sum was established on February 12, 1959, by the Decree of the Presidium of the MPC of the Mongolian People's Republic. It formerly belonged to Jargalant and Sagsai, then both of Khovd Province.[2]
The centre of the district, Chikhertei, lies west of Ölgii. To the southwest of the town is the lake, Darihan Nuur.
The main occupation in the district is agriculture. As of 2015 there were 120,650 livestock, consisting of 10,251 cattle, 57,106 sheep, 6,159 horses, 46,737 goats and 397 camels. 7620 tonnes of hay is harvested each year. The locals grows vegetables such as potatoes. 21 small business entities operated in the district as of 2015. Electricity has been provided in Altai since 2001 thanks to the establishment of a 10 kW hydropower substation, though only 50% of households have sewerage.[2]