Dunwoody High School is a public high school in Dunwoody, an incorporated city in DeKalb County, Georgia, United States. It also serves students in the city of Doraville. Dunwoody enrolls students in grades 9-12, and is operated by the DeKalb County School System. It follows a four by four block schedule, in which students attend four classes every day for 90 minutes. In 1988, Dunwoody merged with another local high school, Peachtree High School.