Ondina obliqua is a rare species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

The very thin, whitish shell has a transparent, glossy appearance.

The teleoconch contains five whorls, marked with fine, close spiral striae, becoming coarser on the base.

The outer lip is flexuous, retreating, sinuated above.

The columellar tooth shows only a slight obscure fold.