Eucosma agnatana is a species of moth of the family Tortricidae. It is found in China (Hebei, Shanxi, Inner Mongolia, Shaanxi, Qinghai), Mongolia, Russia, Kazakhstan,Catalogue of Eucosmini from China (Lepidoptera: Tortricidae) Romania, Russia and the Near East.Fauna Europaea

The wingspan is 13–17 mm. Adults are on wing from August to September.

The larvae feed on Artemisia fragrans, Artemisia nutans and Artemisia monogyna.

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