The European Control Association (EUCA) has been organizing the European Control Conference (ECC) annually since 2013. The ECC aims to bring together professionals from academic and industrial backgrounds in the field of systems and control, with the goal of promoting scientific collaboration and exchange within the European Union, and between Europe and other parts of the world. ECC2023 will be the 21st conference in the EUCA series, taking place in Bucharest, Romania, from June 13 to June 16, 2023. The University Politehnica of Bucharest is the local host organization for the event, with technical co-sponsorship being provided by the IEEE Control Systems Society (CSS) and the International Federation of Automatic Control (IFAC).