Cophixalus balbus is a species of frogs in the family Microhylidae. Molecular data suggest that it might belong to the genus Oreophryne. It is known from the vicinity of its type locality in Yapen island, Papua Province, Indonesia, as well as from the Hunstein Mountains (East Sepik Province) and Bewani and Torricelli Mountains (West Sepik Province) in Papua New Guinea.