This book compiles the proceedings of the 9th International Conference on Smart Learning Environments (ICSLE 2025), hosted by the University of Eastern Finland in Joensuu (October 16–17, 2025). The conference brings together researchers, practitioners, and policymakers to examine how rapid technological evolution reshapes learning and teaching, the transformative role of AI in education, and strategies for safe and ethical human-machine collaboration. The topics cover: Next generation learning environments; Collaboration among humans, human-machine collaboration, interactions or dynamics; Pedagogy, learning approaches and instructional design; Digital transformation for catalyzing online, immersive and open learning spaces; and Digital, machine and AI ethics in education.