Izatha oleariae is a species of moth in the family Oecophoridae. It is endemic to New Zealand. This species is classified as "At Risk, Naturally Uncommon" by the Department of Conservation. It is only found on the Snares Islands.
This species was first described by John S. Dugdale in 1971 using specimens collected at Station Point at the Snares Islands by Peter M. Johns. In 2010 Robert J. B. Hoare discussed this species and gave a detailed description of the same. The holotype specimen is held at the New Zealand Arthropod Collection.
Dugdale originally described the species as follows:
This species is endemic to New Zealand. It is only known from the subantarctic Snares Islands.
The larvae of this species are wood borers. Adults are on wing from November to February.
A host species of the larvae of this moth is Olearia lyallii. Larvae have also been collected in bark of Brachyglottis stewartiae.
This species has been classified as having the "At Risk, Naturally Uncommon" conservation status under the New Zealand Threat Classification System.