Comitas declivis is an extinct species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae.
The length of the shell attains 19 mm, its diameter 6.3 mm.
This marine species is endemic to New Zealand. Fossils have been in Lower Pliocene strata (Waitotaran) near the mouth of the Waihi stream, Hāwera.
