The Defoe Shipbuilding Company was a small ship builder established in 1905 in Bay City, Michigan, United States. It ceased to operate in 1976 after failing to renew its contracts with the United States Navy. The site of the former company is now being developed for business and housing on the bank of the Saginaw River.

Bay City is a city in and the county seat of Bay County, Michigan, United States. The population was 32,661 at the 2020 census. The city is located just upriver from Saginaw Bay on the Saginaw River. It is the principal city of the Bay City metropolitan area, which is coterminous with Bay County as part of the larger Greater Tri-Cities region of Central Michigan. Several historic bridges cross the Saginaw River in Bay City, including Liberty Bridge, Veterans Memorial Bridge, Independence Bridge, and Lafayette Avenue Bridge.