Two species of the subfamily Moelleriinae Hickman et McLean, 1990-Moelleria costulata (Møller, 1842) and Spiromoelleria quadrae (Dall, 1897) - have been reported from the northwestern Pacific so far. The present paper clarifies their distribution in the region based on the museum collections and newly obtained material from the northwestern Pacific. Also, one more species, Spiromoelleria maculata (Golikov et Gulbin, 1978), which previously had been considered as a member of the genus Homalopoma Carpenter, 1864 (subfamily Coloniinae), is here suggested to be a member of Moelleriinae.