<p>This book constitutes the proceedings of the 12^th International Conference on Informatics in Schools: Situation, Evolution and Perspectives, ISSEP 2019, held in Larnaca, Cyprus, in November 2019.&nbsp;The 23 revised full papers presented were carefully reviewed and selected from 55 submissions. They are organized in topical sections named : teacher education in informatics, primary education in informatics, contemporary computer science ideas in school informatics, teaching informatics: from highschool to university levels, contests, competitions and games in informatics.</p>