Hyposmocoma opuumaloo

Hyposmocoma opuumaloo is a species of moth of the family Cosmopterigidae. It is endemic to Necker Island. The type locality is Flagpole Hill.

The wingspan is 8.9–9.1 mm.

The larval case is cone-shaped and 6.7–7.1 mm in length.

Adults were reared from case-making larvae. Larvae were collected on the ground.