Stenostomidae is a family of freshwater catenulid flatworms.

It is the most species-rich family of catenulids, with about 70 species described, most of them in the Neotropics.

[2] Catenulids of the family Stenostomidae are characterized by the brain divided into four clearly separated lobes, two anterior and two posterior, which lie near the mouth.

The preoral zone contains a group of sensor cells with ciliated pits organized in long precerebral series.

This flatworm- (or platyhelminth-) related article is a stub.