Halcyon London International School is an independent mixed school located in the heart of London at 33 Seymour Place, W1H 5AU. The school caters to students aged 11 to 18 and currently has approximately 165 pupils enrolled, with a capacity for 230 students. Halcyon is a not-for-profit institution, distinguishing itself as London’s only independent International Baccalaureate (IB) school. The school's mission is to realize every student's full potential, fostering a community where curiosity and creativity thrive. As an urban school, Halcyon serves a diverse student population from various backgrounds, contributing to its vibrant and inclusive culture.
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Compiled from official UK government data (GIAS), Ofsted inspection records, and information from the school's own website. Sections marked "AI summary" were written by AI (OpenAI GPT-4o) from these sources and are not individually checked by a person. Last verified 1 May 2026. Spot an error? Let us know.