Marietta High School is a public high school located in Marietta, Georgia, United States. It is part of the Marietta City Schools district and serves grades 9 through 12 with an enrollment of approximately 2,654 students (2023-2024). The school is recognized as a Georgia College & Career Academy and an International Baccalaureate (IB) World School since July 1995. It was also named an ITEEA STEM School of Excellence in 2024. The school offers a College & Career Academy and has a mascot known as the Blue Devil.