Exostoma is a genus of sisorid catfishes native to Asia.

[1][2] E. stuarti is from the Ayeyarwady River of Burma and India; however, it has not been collected since its original discovery.

[2] In a 2007 checklist of sisorid and erethistid catfishes, Thomson lists E. stuarti and E. vinciguerrae as valid species.

[4] The following species are currently recognized in the genus Exostoma: Exostoma is distinguished by having a continuous groove behind the lips (post-labial groove), the gill openings not extending onto the underside (venter), homodont dentition of oar-shaped, distally flattened teeth in both jaws, the tooth patches separated in upper jaw, and 10–11 branched pectoral rays.

The teeth are small to large, moveable, oar-shaped, flattened distally and directed posteriorly in distinct patches.