Charlevoix County is a county in the U.S. state of Michigan. The county seat is Charlevoix, and the largest city is Boyne City. Located in the Northern Lower Peninsula, Charlevoix County is bisected by Lake Charlevoix, Michigan's third largest inland lake. As of the 2020 census, the county's population was 26,054.

Boyne City is a city in Charlevoix County in the U.S. state of Michigan. The population was 3,816 at the 2020 census, making it the largest city in Charlevoix County. Boyne City is located at the eastern end of Lake Charlevoix, Michigan's third largest inland lake. The city is also the site of the mouth of the Boyne River, named for the River Boyne in Leinster, Ireland.