River Rangpo is a river in the Indian state of Sikkim. A tributary of the Teesta River, it is fed by the Rangpo chu. The town of Rangpo in Sikkim lies on its north bank. The river forms the border between Sikkim and West Bengal states at Rangpo town. There is no separate name for the town in West Bengal that lies on south bank of the river and therefore it is also called Rangpo.