Coleophora tanaceti is a moth of the Coleophoridae family. It is found from Spain, north to Fennoscandia, east to the Baltic region, south to Italy and Bulgaria. It has also been recorded from the Near East. The wingspan is 11–14 mm. The larvae feed on Tanacetum vulgare. They create a smooth, brown, trivalved, tubular silken case. The case has a sharp bend just behind the mouth and a length of 6–8 mm. The mouth angle is about 10°.