瓜亚斯河是厄瓜多尔尔的河流，位于该国西部沿海低地，河道全长389公里，集水区面积36,000平方公里，发源自钦博拉索山山脚，河畔城镇有瓜亚基尔。

The Guayas River is a river in western Ecuador. It gives name to the Guayas Province, and it is the most important river in South America that does not flow into the Atlantic Ocean or any of its seas. Its total length, including the Daule River, is 389 km. It is the national river of Ecuador, and is present on the Coat of Arms.