Eudonia philerga is a species of moth of the Crambidae family. It is found in New Zealand. The wingspan is 17–21 mm. The forewings are white, mixed with grey and irrorated with black. There is a thick interrupted blackish streak from the base of the costa. The first line is white, blackish-margined posteriorly. The second line is white, dark-margined anteriorly. The hindwings are pale whitish-grey, somewhat tinged with ochreous. Adults have been recorded on wing in December, January, March and April.