Eulimastoma engonium, common name the needle odostome, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

The seven whorls of the teleoconch are flattened, distinctly chamfered above the channeled suture.

The body whorl is distinctly angulated at the periphery, where there is a prominent rounded thread.

There are also numerous indistinct, unequal striae only visible under a microscope.

The columella has a small distinct fold, not seen in a front view.