The Grande Ronde River is a tributary of the Snake River, 212 miles (341 km) long, in northeastern Oregon and southeastern Washington in the United States. It drains an area southeast of the Blue Mountains, and northwest of the Wallowa Mountains, on the Columbia Plateau. It flows through the agricultural Grande Ronde Valley in its middle course and through a series of scenic canyons in its lower course.

It rises in the Blue Mountains near the Anthony Lakes recreation area in the Wallowa–Whitman National Forest in southwestern Union County approximately 20 miles (32 km) south of La Grande. It flows generally north along the east side of the Blue Mountains, then east, past La Grande, then generally northeast through the Grande Ronde Valley in a meandering course between the Blue Mountains and the Wallowa Mountains, receiving Catherine Creek east of La Grande.

Approximately 10 miles (16 km) northwest of Minam it receives the Wallowa River from the southeast, then receives the Wenaha River at Troy just south of the Washington border. It crosses into southeastern Washington, traversing the extreme southeast corner of the state and entering the Snake from the east, approximately 5 miles (8.0 km) north of the Oregon border and 15 miles (24 km) downstream from the mouth of the Salmon River. It receives Joseph Creek from the south 2 miles (3.2 km) upstream from its mouth on the Snake.

The mouth is located at the Snake's river mile 169, which is 493 miles (793 km) from the mouth of the Columbia River.

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