Old Mission is an unincorporated community in Grand Traverse County in the U.S. state of Michigan. It is located within Peninsula Township near the tip of Old Mission Peninsula along the shores of the East Arm of Grand Traverse Bay. As an unincorporated community, Old Mission has no legally defined boundaries or population statistics of its own.

Grand Traverse County is a county located in the U.S. state of Michigan. As of the 2020 census, the population was 95,238, making it the largest county in Northern Michigan. Its county seat is Traverse City. The county is part of the Traverse City metropolitan area, which also includes neighboring Benzie, Kalkaska, and Leelanau counties.