Morgan County is a county in the north-central part of the U.S. state of Alabama. As of the 2020 census, its population was 123,421. The county seat is Decatur. On June 14, 1821, it was renamed in honor of American Revolutionary War General Daniel Morgan of Virginia. It is a prohibition or dry county, although alcohol sales are allowed in the cities of Decatur, Hartselle, and Priceville. Morgan County is included in the Decatur, AL Metropolitan Statistical Area, which is also included in the Huntsville-Decatur-Albertville, AL Combined Statistical Area. It is a part of the North, Northwest, and North-Central regions of Alabama.

Decatur is the largest city and county seat of Morgan County in the U.S. state of Alabama. Nicknamed "The River City," it is located in northern Alabama on the banks of Wheeler Lake along the Tennessee River. The population was 57,938 at the 2020 census.