Cacoal is a municipality located in the Brazilian state of Rondônia. It serves as one of the region's significant urban centers and currently ranks as the fourth-largest city in the state.
The municipality covers a total area of 3,792.892 square kilometres (1,464.444 sq mi) and experiences a Tropical savanna climate. As of 2020, the estimated population of Cacoal was 85,893.