Rich Mountain slitmouth or Pilsbry's narrow-apertured land snail, scientific name Stenotrema pilsbryi, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Polygyridae.

This species is endemic to Ouachita Mountains of the United States.

The Rich Mountain slitmouth occurs in a very small range in southeast Oklahoma and southwest Arkansas.

The species was first described on the Arkansas side of Rich Mountain as Polygyra pilsbryi.

Its range is further limited in that it only occurs on the characteristic talus rock glaciers of the Ouachitas.