Several rivers in the United States are named Green River.

1 - The Green River is 595 km (370 miles) long. It ruses in central Kentucky and flows generally northwest through Mammoth Cave National Park into the Ohio River near Evansville, Indiana. Locks and dams make the Green River navigable upstream to the park.

2 - The Green River is 1,175 km (730 miles) long. It rises near the Continental Divide in the west of Wyoming and flows generally south through the west of that state, northwestern Colorado and eastern Utah to the Colorado River in Canyonlands National Park in the southeast of Utah. The Green River is the largest tributary of the Colorado River. Most of its course flows through deep canyons, including Canyon of the Lodore in Dinosaur National Monument. The White, Yampa and San Rafael rivers are its main tributaries. The Colorado River storage project of the U.S. Bureau of Reclamation has extensively developed the Green River basin for irrigation, mining and hydroelectric power. The Flaming Gorge Dam in northeastern Utah is the major unit in this project.