麦基诺县（Mackinac County, Michigan）是美国密西根州上半岛东部的一个县，西临密西根湖，中为基威诺湾，东临休伦湖。面积5,440平方公里。根据美国2000年人口普查，共有人口11,943人。县治圣伊格纳斯 （St. Ignace）。

成立于1818年10月26日。原名Michilimackinac县，1843年3月8日改用现名。县名是印第安人词语「鼈」的意思。

Mackinac County is a county located in the Upper Peninsula of the U.S. state of Michigan. As of the 2010 census, the population was 11,113. The county seat is St. Ignace. Formerly known as Michilimackinac County, in 1818 it was organized as one of the first counties of the Michigan Territory, as it had long been a center of French and British colonial fur trading, a Catholic church and Protestant mission, and associated settlement.