Udea inquinatalis is a species of moth in the Crambidae family. It is found in most of Europe (except Ireland, Great Britain, the Benelux, the Iberian Peninsula and most of the Balkan Peninsula) and North America (including Quebec, Manitoba, Michigan and Minnesota). The wingspan is 18–25 mm. The larvae feed on Betula alba, Betula nana, Salix species, Vaccinium myrtillus and Spiraea ulmaria.