The Treaty of Fond du Lac may refer to either of two treaties made and signed in Duluth, Minnesota between the United States and the Ojibwe (Chippewa) Native American peoples.
The first treaty of Fond du Lac was signed by Lewis Cass and Thomas L. McKenney for the United States and representatives of the Ojibwe of Lake Superior and the Mississippi on August 5, 1826, proclaimed on February 7, 1827, and codified in the United States Statutes at Large as 7 Stat. 290. The Ojibwe chiefs who were not in attendance to the First Treaty of Prairie du Chien agreed to its adhesion. The Ojibwe Nations granted to the United States the rights to minerals exploration and mining within Ojibwe lands located north of the Prairie du Chien Line. Provisions were also made for the Ojibwe living about Saint Mary's River. As addenda to this treaty, arrest warrants to certain individuals living outside the jurisdiction of the United States were issued and land grants to the Métis were made.
The second treaty of Fond du Lac was signed by Issac A. Verplank and Henry Mower Rice for the United States and representatives of the Ojibwe of Lake Superior and the Mississippi on August 2, 1847, proclaimed on April 7, 1848, and codified as 9 Stat. 904. This treaty ceded lands in a triangular area west of the Mississippi River, bounded by the Prairie du Chien Line, Mississippi River, Crow Wing River and Long Prairie River.