The Cluster Meeting 2023 (CM2023) will be held from June 18th till 23rd 2023 in Prague (https://www.clustermeeting2023.eu/). CM2023 is a topical international conference with main focus on catalysis, reactivity, characterization, imaging and modeling of primarily size-selected clusters, as paradigmatic confined systems. The goal of the conference is to promote scientific exchange and interdisciplinary collaborations so as to accelerate progress in this exciting field of nanoscience, with apparent connections to the COSY COST Action, and several COSY members (especially from WG3) attending and/or giving presentations. The Cluster Meeting 2023 has been included as targeted conference among ITC-premised ones within the COSY COST Action.