The American School of Classical Studies at Athens is the leading American teaching and research institution in Greece, dedicated to the advanced study of all aspects of Greek culture, from antiquity to the present. Founded in 1881, the School provides students and scholars from over 190 affiliated North American colleges and universities with the opportunity to explore the full range of scholarly resources in Greece. It was the first American overseas research center, and today it is the largest of the eighteen foreign institutes in Athens—and the only one that provides a regular program of instruction to students. It operates excavations in the Athenian Agora and Ancient Corinth, two distinguished libraries (the Blegen and the Gennadius), an archaeological laboratory (the Malcolm H. Wiener Laboratory for Archaeological Science), and an award-winning publications department. It is also the administrative base for all other archaeological research in Greece conducted by North American institutions.

The American School is a member of the Council of American Overseas Research Centers (CAORC).

The School remains, as its founders envisioned, a privately-funded, nonprofit educational and cultural institution.