Duluth is a city in Gwinnett County, Georgia, United States. Located north of Interstate 85, it is approximately 22 miles (35 km) northeast of Atlanta.

Gwinnett County is located in the north central portion of the U.S. state of Georgia. It forms part of the Atlanta metropolitan area, being located about 9 miles (14 km) northeast of Atlanta city limits. In 2020, the population was 957,062, making it the second-most populous county in Georgia. Its county seat is Lawrenceville. The county is named for Button Gwinnett, one of the signatories of the Declaration of Independence.