Established in 2013 following the merger of Gateway College Colombo 4 and the American International School, Gateway College, Dehiwala caters to children of all age groups from Play Group to Advanced Level. The facilities include a seven story building with spacious science and computer laboratories, libraries, classrooms, swimming pool and a large auditorium which serves as an indoor basketball stadium as well. A day care centre will be opening soon. It is patronised by students living in the Western and Southern parts of Colombo and the coastal areas down to Panadura and beyond.