Euroanalysis is a biannual international conference of the European Chemical Society that attracts about 900 delegates. This 21st edition is locally organized by the Swiss Chemical Society. It provides a forum for the European Analytical World to discuss the latest developments in analytical sciences. The theme of the 2023 meeting is “Analytical Probing of Complex Systems”. It reflects the urgent need to observe chemical changes in complex systems, from materials surfaces, to living cells and ecosystems, in real time and with adequate spatial resolution