Three Rivers South is a census-designated place (CDP) and unincorporated community in Deschutes County, Oregon, United States.

It is part of the Bend, Oregon Metropolitan Statistical Area.

[citation needed] According to the United States Census Bureau, the CDP has a total area of 7.5 square miles (19.5 km2), all counted as land.

There were 1,575 housing units at an average density of 165.9 per square mile (64.1/km2).

20.1% of all households were made up of individuals, and 5.7% had someone living alone who was 65 years of age or older.