Redan is an unincorporated community and census-designated place in DeKalb County, Georgia, United States. As of the 2020 census, the CDP had a total population of 31,749. It is a predominantly African American community in eastern DeKalb County, and is a suburb of Atlanta. According to tradition, the name "Redan" is an amalgamation of the names of two early settlers: N. M. Reid and Annie Alford. Redan High School is located in Redan CDP, and Lithonia High School was formerly in the Redan CDP.