The Mayor of Ulaanbaatar (Mongolian: Улаанбаатар хотын захирагч) is head of the executive branch of the political system of the city of Ulaanbaatar, Mongolia.

The mayor's office administers all city services and public agencies, and enforces all city laws.

There have been 35 mayors of Ulaanbaatar.

The Mayor's Office provides professional advice to the City Council and the Mayor of Ulaanbaatar.

It also implements the Mayor's platform.