Thoropa petropolitana is a species of frog in the family Cycloramphidae.

It is endemic to Serra dos Órgãos in the state of Rio de Janeiro, Brazil; there are also unconfirmed records from the neighboring Espírito Santo and São Paulo states.

[1][2] Thoropa petropolitana occurs at elevations above 800 m (2,600 ft) in rocky areas in forest, or on the forest edge, where it lives on wet rock faces near streams or waterfalls.

Threats to it include habitat loss caused by clear-cutting, human settlement, tourism, and fire.

However, it has also declined in areas with suitable habitat, suggesting that chytridiomycosis might be a factor.