In this preface, the editors present an overview of the topics and scope of the European Conference on Modelling Foundations and Applications (ECMFA) and describe the editorial and reviewing process for its 19th edition (ECMFA 2023). The papers selected for publication and presentation are overviewed, and the details about the keynote talk by Andrzej Wasowski, professor in the IT University in Copenhagen, are given. Finally, the ECMFA committees are acknowledged.