"Eucosma" symploca is a species of moth of the Tortricidae family. It is found in Australia, where it has been recorded from Queensland. The wingspan is about 9 mm. The forewings are dark brownish fuscous with a large whitish suffused blotch and three short oblique whitish costal strigulae (fine streaks), as well as some transverse whitish strigulae in the dorsal area. The hindwings are pale grey.