Athens Technological Organization (ATO) was a non-profit organization established in 1958 to further technology and scientific research on any subject which can contribute to the improvement of human living conditions, technical and economic development and the training of people capable to pursuing these purposes. Upon its establishment, in 1958, ATO started ekistic research and educational programs and later on, in 1963, established Athens Center of Ekistics (ACE) to foster a concerted program of research, education, documentation, and international cooperation related to the art and science concerned with the development of human settlements. Its publications include Ekistic: the Problems and Science of Human Settlements, the Ekistic Index of Periodicals, and also a series of research reports and monographs documenting its four major research projects: The City of the Future (COF), The Capital of Greece (COG), The Human Community (HUCO) and The Ancient Greek Cities (AGC). Since 1965, ACE has hosted on its premises the Headquarters and Secretariat of the World Society for Ekistics (WSE), an independent organization, whose goals and objectives are compatible with those of ACE.

ACE/ATO closed in December 2017 after the passing of its President Panayis Psomopoulos (August 2017)