The Treaty of Chicago may refer to either of two treaties made and signed in Chicago, Illinois between the United States and the Ottawa, Ojibwe (Chippewa), and Potawatomi Native American peoples.
The first treaty of Chicago was signed by Michigan Territorial Governor Lewis Cass and Solomon Sibley for the United States and representatives of the Ottawa, Ojibwe, and Potawatomi on August 29, 1821, and proclaimed on March 25, 1822. The treaty ceded to the United States all lands in Michigan Territory south of the Grand River, with the exception of several small reservations.
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