| Sergelen District | |
| Native Name: | Mongolian: Сэргэлэн сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Töv Province |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Sergelen (mn|Сэргэлэн, in Mongolian pronounced as /ˈsirɡɮɪŋ/; "smart") is a district of Töv Province in Mongolia.
See main article: Chinggis Khaan International Airport.
Khöshigt Valley, located in Sergelen, is the location of Chinggis Khaan International Airport, which started its operations in 2021. The airport, built with a loan from the Japanese Government, has a capacity twice that of Buyant-Ukhaa International Airport, and has a highway connection to Ulaanbaatar.[1] It is also planned to build the modern city of 100,000 population by the airport.[2]