Lakeside High School is a public high school in unincorporated DeKalb County, Georgia, United States. The school has an Atlanta address (3801 Briarcliff Road) and is part of the DeKalb County School System. Lakeside is a public school encompassing grades 9-12. The school is located in a predominantly upper middle class suburban community and serves students from the Northlake area of the DeKalb County School District. Lakeside High School opened its doors in 1964.