Rimellopsis powisii, common name Powis's tibia, is a species of large sea snail, a marine gastropod mollusks in the family Rostellariidae within the Stromboidea, the true conchs and their allies.

[1] The length of the shell varies between 30 mm and 75 mm.

This marine species occurs from Southern Japan, and in the Indo-West Pacific to New Caledonia and Queensland, Australia