The Guam Department of Education (GDOE), formerly the Guam Public School System, is a school district in Guam that serves roughly 4,000 employees and 30,000 school children. The district is headquartered at the GDOE Tiyan offices located at 501 Mariner Avenue Barrigada, Guam. The Guam Department of Education is a single unified school district consisting of grades pre-kindergarten through 12th grade. The district serves 26 elementary schools, eight middle schools, six high schools and one alternative school.

Through the proper management of resources, continued improvement of programs and offerings, and dedication to excellence in education, the department has helped thousands of students graduate and enter the world of work or higher education. Providing a quality education and helping students complete their high school education is essential both to the future successes of these students, and to the Guam community as a whole. Research shows that high school graduates are more likely to earn higher wages, be employed, pay higher taxes, and therefore contribute positively to the island economy. It is the department's mission to prepare all children for success in the work force, higher education, and society.