Bayanzürkh (Mongolian: Баянзүрх, rich heart) is one of nine Düüregs (districts) of the Mongolian capital of Ulaanbaatar.

It is the largest district in the capital and lies in the southeast of the city.

In 2023 it had an approximate population of 420,793 people in 131,902 households.

A total of 23 state kindergartens and 19 secondary schools are located in the district area.

The head office of Eznis Airways is located in the Shine Dul Building (Шинэ Дөл Билдинг) in Bayanzürkh.