Sergelen (Mongolian: Сэргэлэн, pronounced [ˈsirɡɮɪŋ]; lit.

"smart") is a district of Töv Province in Mongolia.

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.