Eudonia oreas is a moth in the family Crambidae. This species was named by Edward Meyrick in 1884. It is endemic to New Zealand and is only found in the Otago region of the South Island. It inhabits the high alpine zone throughout Otago and can also be found in low lying areas around Dunedin. The adults and larvae have been found on rock faces. Adults are recorded as being on the wing in December.

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