{ { Speciesbox
| name = Eudonia steropaea
| image = Eudonia steropaea female.jpg
| image_caption = Female
| image2 = Eudonia steropaea male.jpg
| image2_caption = Male
| taxon = Eudonia steropaea| authority = (Meyrick, 1884) | synonyms =
| synonyms_ref =
}}Eudonia steropaea'' is a species of moth of the family Crambidae. It was named by Edward Meyrick in 1884. Meyrick gave a detailed description of this species in 1885. It is endemic to New Zealand.
The wingspan is 13–16 mm. The forewings are pale fuscous, irrorated with darker. There is a small blackish spot at the base of the inner margin and a straight black streak from the base to somewhat before the middle of the disc, almost meeting a triangular blackish blotch. The first line is indicated by an angulated darker posterior margin. The second line is white. The hindwings are grey-whitish, the hindmargin somewhat suffused with darker. Adults have been recorded on wing in January.