The school was founded by a small group of American parents from the
American University of Beirut, then known as the Syrian Protestant College, who wanted a school where their children could receive preparation for entrance into American universities. The small faculty school thrived and by 1920 had expanded from its original home on rue Bliss to a red-roofed house on rue Sidani. At this point, the
American Presbyterian Mission joined the AUB in sponsorship of the school. It was at this point that the school was renamed to the American Community School. By the 1940s, the student body had grown to more than 900 primarily
Western children; the present building was built in 1949 with funds provided by
ARAMCO. Today, students are primarily Lebanese, as with the university. The school celebrated its Centennial on June 24, 2005, and in June 2011, ACS Beirut celebrated the graduation of its 100th graduating class. Dr. George H. Damon Jr. remained Headmaster of the school from 2003 till his retirement in 2013. ACS's history is described by Wade Morris Jr. in
A History of ACS; The American Community School at Beirut 1905-2012. == Academics ==