montane brown frog

{{Short description|Species of amphibian}}

{{Speciesbox

| image = Raninae Rana R ornativentris Montane brown frog.jpg

| status = LC

| status_system = IUCN3.1

| taxon = Rana ornativentris

| authority = Werner, 1903

|status_ref={{cite iucn |author=IUCN SSC Amphibian Specialist Group |date=2021 |title=Rana ornativentris |volume=2021 |page=e.T58688A179361616 |doi=10.2305/IUCN.UK.2021-1.RLTS.T58688A179361616.en |access-date=17 November 2021}}

}}

The montane brown frog or Nikkō frog (Rana ornativentris) is a species of frog in the family Ranidae. It is endemic to Japan.

Its natural habitats are subtropical or tropical dry forests, rivers, swamps, freshwater marshes, arable land, irrigated land, and seasonally flooded agricultural land.