The Multnomah are a tribe of Chinookan people who live in the area of Portland, Oregon, in the United States. Multnomah villages were located throughout the Portland basin and on both sides of the Columbia River. The Multnomah speak a dialect of the Upper Chinookan language in the Oregon Penutian family.

Chinookan peoples include several groups of Indigenous people of the Pacific Northwest in the United States who speak the Chinookan languages. Since at least 4000 BCE Chinookan peoples have resided along the upper and Middle Columbia River (Wimahl) from the river's gorge downstream (west) to the river's mouth, and along adjacent portions of the coasts, from Tillamook Head of present-day Oregon in the south, north to Willapa Bay in southwest Washington. In 1805 the Lewis and Clark Expedition encountered the Chinook Tribe on the lower Columbia.