Eudonia perierga is a moth in the family Crambidae.

It is found in Australia, where it has been recorded from Tasmania.

The forewings are white, suffused with light greyish fuscous or yellowish fuscous, and irregularly irrorated (sprinkled) with black.

There is a short thick interrupted cloudy blackish streak from the base of the costa.

The hindwings are whitish grey suffused with darker, the apex and upper part of the hindmargin suffused with dark fuscous.