Onaway is a city in Presque Isle County, just east of the Cheboygan–Presque Isle county line in the U.S. state of Michigan. The population was 880 at the 2010 census. Onaway is the Sturgeon Capital of Michigan, and there is a lake sturgeon streamside rearing facility on the nearby Black River, where the fish migrate down to the Cheboygan River and then to Lake Huron.