巴尔萨斯河是墨西哥的河流，位于该国中南部，河道全长771公里，流域面积112,320平方公里，发源自普埃布拉，最终在拉萨罗卡德纳斯附近注入太平洋。

The Balsas River (Spanish Río Balsas, also locally known as the Mezcala River, or Atoyac River) is a major river of south-central Mexico.

The basin flows through the states of Puebla, Morelos, Guerrero, and Mexico. The river flows through the Sierra Madre del Sur, and empties into the Pacific Ocean at Mangrove Point, adjacent to the city of Lázaro Cárdenas, Michoacán. Several rapids along the course of the Balsas River limit its navigability and thus the river has been largely used for generation of hydroelectric power, flood control and irrigation.