River Cess is a county in the south-central portion of Liberia. One of 15 counties that comprise the first-level of administrative division in the nation, it has six districts.

Cesstos City serves as the capital with the area of the county measuring 5,594 square kilometres (2,160 sq mi). As of the 2008 Census, it had a population of 65,862, making it the second least most populous county in Liberia.

Eighth largest in size, it is bordered by Grand Bassa County to the west, Nimba County on the northeast, and Sinoe County to the southeast. The southern part of River Cess lies on the Atlantic Ocean. Created in 1984.

Hon. B. Rancy Ziankahn is the County Superintendent