Mormogystia brandstetteri is a moth in the family Cossidae.

It is endemic to the Socotra Archipelago, part of Yemen in the Indian Ocean.

There is a black costal spot on the ventral hindwing The larvae probably feed on Acacia species.

The species is dedicated to Johann Brandstetter, a German painter and entomologist.

This article relating to the moth subfamily Cossinae is a stub.