Eleven species (10 new) of myodocopid Ostracoda are described from O'ahu, Hawai'i. Five species were collected in Kane'he Bay and 8 in the vicinity of Waikiki, but only 2 species were common to both locales. The most abundant species in the collections (Cypridina alpah, n. sp.) was represented only by adult females, of which most contained either eggs or embryos in their marsupia. Four new species are reported from French Frigate Shoals of which 3 are also present at O'ahu, and one, Harbansus hox, is present only at French Frigate Shoals.