Fort de Buade was a French fort in the present U.S. state of Michigan's Upper Peninsula across the Straits of Mackinac from the northern tip of lower Michigan's "mitten". It was garrisoned between 1683 and 1701. The city of St. Ignace developed at the site, which also had the historic St. Ignace Mission founded by Jesuits. The fort was named after New France's governor at the time, Louis de Buade de Frontenac.