Hylarana montivaga, sometimes known as Langbian Plateau frog or Chantaburi stream frog, is a species of "true frog" in the family Ranidae. Its generic placement is currently unsettled. It is known from the Langbian Plateau in southern-central Vietnam; records from elsewhere (including Thailand) refer to other species.
This species is known from streams in evergreen forests at elevations of 1500m–2000mm (4,900feet–7,000feetm) above sea level. It is currently listed as "endangered" by the International Union for Conservation of Nature (ICUN). This is due to agriculture and aquaculture within their habitats, and biological resource use.