The Arab Academy for Science, Technology and Maritime Transport (AASTMT) in cooperation with the Computer Scientific Society (CSS) with technical co-sponsorship by IEEE Alexandria subsection announces the beginning of the 31st International Conference on Computer Theory and Applications (ICCTA 2021) that will be held during the period from 11 - 13 December 2021, at AASTMT Abukir Campus (Hall of Arab Ministers of Transport) - Alexandria, as ICCTA 2021 will be organized as a hybrid (Physical/Virtual) conference. ICCTA 2021 is an international conference that serves as a multi-disciplinary forum for the exchange of information on research, development, and applications of all topics related to computer theory and its applications, as it gives the opportunities to the researchers, specialists and vendors of Information Technology to get together and exchange ideas and expertise.