乌苏马辛塔河（西班牙语：Río Usumacinta）位于墨西哥东南部和危地马拉西北部，源出危地马拉马德雷(Madre)山脉东北坡，河源称奇克索河(R. Chixoy)。奇克索河先为东向，在科万转为北向，流至危-墨两国边境处时称萨利纳斯河(R. Salinas)，为两国界河，呈西北流向。帕西翁河(R. Pasion)和拉坎图姆河(R. Lacantum)河汇入后，始称乌苏马辛塔河。在佩德拉斯内格拉斯以下，乌苏马辛塔河在坎佩切湾南岸的沼泽地蜿蜒流淌，并在帕利萨达附近分为三支，西支汇入格里哈尔瓦河，中支流入坎佩切湾，东支汇入泰尔米诺斯湖。

The Usumacinta River (Spanish pronunciation: [usumaˈsinta]; named after the Howler monkey) is a river in southeastern Mexico and northwestern Guatemala. It is formed by the junction of the Pasión River, which arises in the Sierra de Santa Cruz (in Guatemala) and the Salinas River, also known as the Chixoy, or the Negro, which descends from the Sierra Madre de Guatemala. It defines part of the border between Guatemala and the Mexican state of Chiapas, then continues its northwesterly course, meandering through the Mexican state of Tabasco to the Gulf of Mexico.