West Ujimqin Banner (Mongolian: ; ) is a banner of Inner Mongolia, China. It is under the administration of Xilin Gol League.
West Ujimqin Banner has a population of 99,255.
West Ujimqin features a humid continental climate (Köppen Dwb), with bitterly cold and very dry winters, very warm, somewhat humid summers, and strong winds, especially in spring. The monthly 24-hour average temperature ranges from in January to in July, with the annual mean at . The annual precipitation is , with more than half of it falling in July and August alone. With monthly percent possible sunshine ranging from 57% in July to 72% in October and February, sunshine is abundant year-round, there are 2,882 hours of bright sunshine annually.
West Ujimqin Banner is divided into 5 towns and 2 sums.