Willamette can refer to: A toponym of the U.S. state of Oregon: Willamette River, a tributary of the Columbia River in northwestern Oregon Willamette Valley, a region in northwest Oregon that surrounds the Willamette River Willamette Valley forests, an ecoregion that includes the Willamette Valley and adjacent parts of Washington Willamette, Oregon, an unincorporated community that's now part of West Linn Willamette National Forest, a National Forest in western Oregon Willamette Falls, a n… (More on Willamette)