Thiotricha oleariae is a moth of the family Gelechiidae. It is endemic to in New Zealand, where it has been recorded from the central part of the North Island south down to Stewart Island. The species is found at altitudes of between sea-level up to 900 metres. The larvae live in a constructed case, are leaf miners and are active in November. The larval host species are within the genus Olearia. Adults are nocturnal and on the wing from November to March.

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