Triptychus niveus is a species of small sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

[2][3] The shell grows to a length of 9.5 mm.

The whorls of the teleoconch are flattened, each with three spiral ribs, the two upper ones nodulous.

The body whorl has two plain ribs below the nodulous ones, and three revolving ridges below the periphery, forming columellar folds.

This species occurs in the following locations:[2]