Leiostyla degenerata is a species of land snail in the family Lauriidae.

It is endemic to Porto Santo Island in the Madeira archipelago.

[1] This snail is found only on the slopes of Pico Branco, a mountain on the island.

It lives with other Leiostyla species in leaf litter and rock cracks.

The population, though small, is likely stable and there are no immediate threats.