Avondale Estates is a city in DeKalb County, Georgia, United States. The population was 3,567 in 2020. It is part of the Atlanta metropolitan area and is near Decatur.

In the 1890s, lots were sold in the area, which was known as Ingleside.

Avondale Estates was founded in 1924 by George Francis Willis, a patent medicine magnate, who purchased the entire village of Ingleside to create a planned community. The city was named after Stratford-upon-Avon, England, birthplace of Shakespeare. Downtown buildings were designed in a Tudor style to reinforce this image, as were many of the houses in the city. The city incorporated in 1927.

Avondale Estates is entirely underlain by granite, and clay-rich soil developed on it. Some of this granite can be seen outcropped along the shore of Lake Avondale.

According to the United States Census Bureau, the city has a total area of 1.1 square miles (2.8 km²), of which 0.88% is water.

As of the 2020 United States census, there were 3,567 people, 1,422 households, and 865 families residing in the city.

The mostly Tudor-style downtown area of Avondale Estates, known as the commercial district, is home to a variety of businesses including consignment stores. Pizza, southern comfort food, and Chicago style hot dogs are some of the restaurant fare options within the city limits. The city is the location of the first Waffle House restaurant which opened on Labor Day weekend in 1955 having been converted into a museum, along with an existing operational full-time Waffle House nearby, with numerous others in the Decatur, Georgia area as well. The Avondale Salad, featured on certain Waffle House lunch menus, derives its name from the city.^{[citation needed]}

A selection of art galleries and studios are located in an area of the city known as the Rail Arts District. Little Tree Art Studios located on Franklin Street, is a warehouse that includes multiple artist studios and a music rehearsal space.