The 4th Edition of European Lasers, Photonics and Optics Summit, ELOS 2025 will take place in Rome, Italy from 10th March to 12th March 2025. This esteemed gathering will convene in at Rome, Italy and virtual platform for global participation. This summit stands as a pinnacle of innovation and collaboration in the field of photonics and optics technologies with the theme "Illuminating the Future: Uniting Innovations in Lasers, Photonics, and Optics". ELOS 2025 will delve into an array of cutting-edge topics, reflecting the rapidly evolving landscape of lasers, photonics, and optics research. From Quantum Optics and Quantum Information to Laser Cosmology & Astrophysics, participants will explore the frontiers of science and engineering. Esteemed speakers and researchers will share insights on Quantum Photonics and Information Technologies, Topological Photonics, and Nonlinear and Quantum Integrated Optics, shedding light on emerging trends and breakthroughs.