Brookhaven is a city in the northeastern suburbs of Atlanta that is located in western DeKalb County, Georgia, United States, directly northeast of Atlanta. On July 31, 2012, Brookhaven was approved in a referendum to become DeKalb County's 11th city. Incorporation officially took place on December 17, 2012, on which date municipal operations commenced. With a population of around 55,366 as of 2021, it is the largest city in DeKalb County. The new city stretches over 12 square miles (31 km2).

DeKalb County is located in the north central portion of the U.S. state of Georgia. As of the 2020 census, the population was 764,382, making it Georgia's fourth-most populous county. Its county seat is Decatur.