Izatha caustopa is a moth of the Oecophoridae family. It is endemic to New Zealand, where it is known very locally from the southern half of the North Island.^[1]

The wingspan is 24–26 mm for males and 29–31.5 mm for females. Adults have been recorded in January, February, December and April.

Larvae have been reared from dead branches of Fuchsia excorticate. They feed during the winter months, driving burrows through the soft wood in all directions. They are full grown about October.