Eudonia critica is a moth in the Crambidae family. It was described by Meyrick in 1885. It is found in New Zealand. The wingspan is 13–15.5 mm. The forewings are fuscous-grey, mixed with blackish. The median space is irrorated with white. The hindwings are dark fuscous-grey, becoming darker posteriorly. Adults have been recorded on wing in January.