Teinostoma is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Teinostomatidae.

[1][2] This genus used to be placed within the family Skeneidae or family Tornidae(as subfamily Teinostomatinae Cossmann, 1917) The shells of species in this genus are usually white and glossy, are transparent when fresh, and are only a few millimeters in maximum size.

The umbilical region is covered with a large, flat callosity.

The aperture is transverse, rounded, greatly produced and elongated, ending anteriorly in a slightly canaliculated point.

The intended description of Teinostoma as "new genus" by A. Adams appeared only later (1855) and there T. politum is the sole included species.