Hyposmocoma trifasciata is a species of moth of the family Cosmopterigidae. It was first described by Otto Swezey in 1915. It is endemic to the island of Hawaii. The type locality is Laupāhoehoe.
. Elwood Zimmerman . 1978 . Insects of Hawaii . 9 Microlepidoptera . The University Press of Hawaii, Honolulu. 10125/7338 .