Iwaoa reticulata is a species of sea snail, a marine gastropod mollusk in the family Horaiclavidae.
It was previously included within the family Clavatulidae.
The length of the shell attains 22.5 mm.
This species occurs in the East China Sea and Suruga Bay to Tosa Bay, Japan, at a depth between 200 m and 300 m; also in the Bismarck Sea.