Río Negro (Spanish pronunciation: [ˈri.o ˈneɣɾo], English: Black River) is a Chilean city and commune in Osorno Province, Los Lagos Region.

The commune is bordered on the north by Osorno and San Juan de la Costa, on the east by Puerto Octay, on the west by the Pacific Ocean, and on the south by Purranque.

According to the 2002 census of the National Statistics Institute, Río Negro spans an area of 1,265.7 km2 (489 sq mi) and has 14,732 inhabitants (7,528 men and 7,204 women).

[2] As a commune, Río Negro is a third-level administrative division of Chile administered by a municipal council, headed by an alcalde who is directly elected every four years.

The commune is represented in the Senate by Camilo Escalona Medina (PS) and Carlos Kuschel Silva (RN) as part of the 17th senatorial constituency (Los Lagos Region).