Ethalia polita is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

[1] The white, solid, semi-opaque shell has an orbiculate-conoidal shape.

The whorls are almost conical and the base is convex containing a large callus.

The round aperture has a continuous peristome.

[2] This marine species occurs off Japan.