ICED XXIII - 23rd International Conference on Education "Education in the Post-Pandemic Era: From Challenges to Opportunities" has been coordinated in Brussels on 19-20 March 2021 as online. The authors made real-time oral presentations in Google Meet virtual rooms. There have been offline presentations on the Interactive Author Forum Platform with pre-recorded videos and slides. Contributions in Education and related multidisciplinary studies were presented and published in the proceedings book (isbn) as well as in (indexed) journal volumes. This conference is part of the ICSS Congress series.