| Nalaikh District | |
| Native Name: | Налайх дүүрэг |
| Native Name Lang: | mn |
| Settlement Type: | Municipal District |
| Flag Size: | 150 px |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Ulaanbaatar |
| Governing Body: | Citizens' Representatives Khural of the Nalaikh district |
| Leader Title: | Governor of District |
| Leader Name: | Ch.Radnaabazar |
| Established Title: | Settlement founded |
| Established Date: | 1922[1] |
| Established Title1: | City status |
| Established Date1: | 1962 |
| Established Title2: | Reorganized as district |
| Established Date2: | 1992 |
| Area Total Km2: | 687.6 |
| Population As Of: | 2022 |
| Population Total: | 39,579 |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
| Coordinates: | 47.7725°N 107.2536°W |
| Elevation M: | 1459 |
| Area Code: | +976 (0) 23 |
| Registration Plate: | НА_ (_ variable) |
| Website: | Official website |
Nalaikh is one of nine districts (düüreg) of the Mongolian capital of Ulaanbaatar. It has an area of 68,700 hectares and a population of 39,579 in 2022[2] (26,529 in 2005). A former coal-mining town, it is subdivided into 8 subdistricts (khoroo) incorporating Shokhoi, Arjanchivlan, Terelj holiday center, and other residential areas, as well as a former Soviet military cantonment, including an airfield.[3]
Nalaikh is linked to Ulaanbaatar by a 43-kilometer narrow-gauge railway line, built in July 1938. The line had three stations (Nalaikh; Amgalan, a Ulaanbaatar suburb; and Kombinat, the city's industrial combine) and operated 14 steam locomotives, 16 passenger carriages, 70 goods wagons, 10 platform wagons, and nine fuel tank wagons. Nalaikh now has a broad-gauge branch line (via Khonkhor) to the Trans-Mongolian Railway. The Kapitalnaya shaft went into operation in 1951, and at full capacity produced 600,000 metric tons of coal a year. Nalaikh gained town status in 1962, and was established as a district of Ulaanbaatar in 1992. Since the closure of the coal mine in the 1990s, the town has had a high rate of unemployment.[3]