West Ujimqin Banner (Mongolian: ᠪᠠᠷᠠᠭᠤᠨ ᠦᠵᠦᠮᠦᠴᠢᠨ ᠬᠣᠰᠢᠭᠤ; Chinese: 西乌珠穆沁旗) is a banner of Inner Mongolia, China.

[2] 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 −18.7 °C (−1.7 °F) in January to 20.2 °C (68.4 °F) in July, with the annual mean at 2.05 °C (35.7 °F).

The annual precipitation is 325 mm (12.8 in), with more than half of it falling in July and August alone.

West Ujimqin Banner is divided into 5 towns and 2 sums.