Río Negro (Spanish pronunciation: [ˈri.o ˈneɣɾo], English: Black River) is a Chilean city and commune in Osorno Province, Los Lagos Region. The city is located 38 km south of Osorno and 6 km west of Route 5. It has an area of 1,266 km² and a population of 14,732 inhabitants (7,204 women and 7,528 men according to census 2002).

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.

In the 19th century, the commune was a property located between Chahuilco and Purranque called Curileufu by the natives. It was founded on lands donated by Jose Miguel Alderete in the year 1896. The first inhabitants were indigenous to the area.

The first alcalde (mayor) was Pedro González.

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). Of these, 6,583 (44.7%) lived in urban areas and 8,149 (55.3%) in rural areas. The population fell by 8.1% (1294 persons) between the 1992 and 2002 censuses.

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 2008-2012 alcalde is Carlos Schwalm Urzúa (RN). The council has the following members:

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