The QCI Days Athens 2025 event, hosted from April 28–30 at the Eugenides Foundation in Athens, Greece, will gather key stakeholders in quantum communication. Organized by GRNET – National Infrastructures for Research and Technology (HellasQCI), AIT Austrian Institute of Technology (QCI-CAT), and UPM – The Technical University of Madrid (EuroQCI Spain), it is held under the auspices of Greece’s Ministry of Digital Governance. As the successor to QKD Days Madrid 2022 and QCI Days Vienna 2024, the event will showcase advancements in quantum-secure communication, featuring discussions on EuroQCI’s progress, use cases, and future plans.