The Champoeg Meetings were the first attempts at formal governance by European-American and French Canadian pioneers in the Oregon Country on the Pacific Northwest coast of North America. Between 1841 and 1843, a series of public councils was held at Champoeg, a settlement on the French Prairie of the Willamette River valley in present-day Marion County, Oregon, and at surrounding settlements. The meetings were organized by newly arrived settlers as well as Protestant missionaries from the Methodist Mission and Catholic Jesuit priests from Canada.

Oregon Country was a large region of the Pacific Northwest of North America that was subject to a long dispute between the United Kingdom and the United States in the early 19th century. The boundaries of the area, which had been created by the Treaty of 1818 without recognizing indigenous claims to the area, consisted of the land north of 42° N latitude, south of 54°40′ N latitude, and west of the Rocky Mountains down to the Pacific Ocean and east to the Continental Divide. Article III of the 1818 treaty gave joint control to both nations for ten years, allowed land to be claimed, and guaranteed free navigation to all mercantile trade. However, both countries disputed the terms of the international treaty. Oregon Country was the American name while the British used Columbia District for the region. Meanwhile, Indigenous nations had lived in the area since time immemorial, though with little legal recognition in the American and British legal systems. Evidence along the Salmon River shows people lived there at least 16,000 years ago, and may have populated the continent after migrating along the Pacific Coast, then following up the Columbia River into the interior.