Euthycera chaerophylli is a species of fly in the family Sciomyzidae, the marsh flies or snail-killing flies.
This species can be found in most of Europe and in the Near East.
Euthycera chaerophylli can reach a length of about . This fly has a slender body. The gray thorax shows 4 lines of brown spots. The prominent eyes are reddish. The head is yellowish. The yellowish antennae are forward-pointing. The wings are mottled with greyish spots.
These flies are univoltine and overwinter in the puparia. The larvae develop in slugs. They develop inside body of the host (endoparasitoids), mainly Deroceras species.