Odostomia oldroydi is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.

The whorls of the protoconch are small, obliquely immersed in the first of the succeeding turns, above which projects the tilted edge which is marked with five raised spiral lirations.

The five whorls of the teleoconch are somewhat inflated, well rounded, moderately contracted at the sutures, strongly slopingly shouldered at the summit.

The spaces enclosed by the ribs and cords are strongly impressed oblong pits, the long axis of which coincides with the spiral sculpture.

The periphery of the body whorl is marked by a spiral groove, crossed by the continuations of the axial ribs, which terminate at the posterior edge of the first basal keel.