Uliastai (; ), also spelled Uliyasutai or Oulia-Sontai, and sometimes known as Javkhlant, is a city in Mongolia  located in the western part of the country and from the capital Ulaanbaatar. Uliastai is the capital of Zavkhan Province and was the 10th most populous city in the country with a population of 24,276 (2000 census). However, recent estimates have the city's population at 16,240 (.) making it the 16th most populous city in Mongolia.