The Official App of Halcyon London International School. Learn more about the school and access all the school information you need as a community member or a visitor. Our new login function ensures a personal experience with Halcyon. We are constantly in development, so keep an eye out for updates. ABOUT HALCYON Situated in Marylebone, London, Halcyon is central London's only not-for-profit International Baccalaureate (IB) school, leading the way forward in education. We inspire students to embrace an unparalleled capability and lifelong passion for learning. Our IB curriculum opens the door to self-directed learning for students aged 11-18. Students work with teachers and their peers to reach intellectually challenging goals they have helped set themselves. They select study techniques they know work best for them. Halcyon delivers a unique, research-driven approach to wellbeing. Students collaborate on how the school is run and feel valued, confident and secure. We embed cutting-edge technology into learning. Our students are supremely well-prepared for the digital revolution of today and tomorrow.