马科姆县（Macomb County）是美国密西根州的一个县，建于1818年1月15日。面积1,476平方公里，根据美国2000年人口普查有788,149人。县治在芒特克莱门斯。

Macomb County is a county located in the eastern portion of the U.S. state of Michigan. As of the 2010 census, the population was 840,978, making it the third-most populous county in the state. Of Michigan's five largest counties, Macomb experienced the most population growth (6.7%) between 2000 and 2010. The county seat is Mt. Clemens.