Hyposmocoma nihoa is a species of moth of the family Cosmopterigidae. It is endemic to Nihoa, Northwestern Hawaiian Islands. The type locality is Miller Canyon.
The wingspan is 6.3–7.6 mm.[1]
The larval case is burrito-shaped and 3.4–4.8 mm in length.
Adults were reared from case-making larvae. Larvae were collected on small bushes and rocks.