ECAI is Europe’s premier AI research venue. We are honoured to host the 26th edition of this conference in person, in Kraków, one of Europe’s most stunning cities. ECAI 2023 will feature, as usual, a full programme of technical papers, as well as many AI-related events of interest for researchers, students and industry professionals. This includes workshops and tutorials, as well as sister conferences for starting researchers (STAIRS) and prestigious applications of AI (PAIS). The conference is supported by the European Association for Artificial Intelligence (EurAI) and the Polish Artificial Intelligence Society (PSSI). The conference centre is within walking distance of the historical city centre.