Halcyon London International School

Marylebone London

IB MYP / DP
International
Ages 11 - 18

Indicative annual tuition

GBP 41,040 – 42,912

Higher fees for London

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Indicative figures from the school's most recent published fees. They vary by year group and extras; confirm current fees with the school before applying.

Curriculum: IB MYP / DP
Ages: 11 - 18
Type: International
Languages: English, French, Spanish
Area: Marylebone
Address: 33 Seymour Place, London W1H 5AU

Last updated 27 September 2026 One of 15 schools we list in London

About Halcyon London International School

Halcyon London International School is a progressive, student-centred IB secondary school in the heart of Marylebone. Offering the IB Middle Years Programme for ages 11-16 and the IB Diploma Programme for ages 16-18, Halcyon has built a strong reputation among London's international community for its innovative, project-based approach to learning that goes well beyond conventional academic instruction.

The school is deliberately small — capped at around 200 students — which allows for deeply personalised learning, strong teacher-student relationships, and a genuine community feel that is difficult to find in larger London schools. Students are encouraged to pursue interdisciplinary projects, entrepreneurial thinking, and real-world problem solving alongside the rigorous IB curriculum.

Located in an elegant Marylebone townhouse setting, Halcyon attracts globally minded families from the arts, media, technology, and international business sectors who value creativity and independent thinking as much as academic achievement. Its location near Regent's Park and Oxford Street makes it highly accessible for families across central and north London.

Facilities and campus

Science Labs
Art Studios
Music Rooms
Library
Rooftop Terrace
Common Rooms
Counselling Suite
Cafeteria

Accreditations and memberships

As listed by the school. Check with the accrediting body if it matters for your decision.

Location and contact

Halcyon London International School

33 Seymour Place, London W1H 5AU

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Questions parents ask

Halcyon London International School follows the IB MYP / DP curriculum, catering to students aged 11 - 18.

Indicative annual tuition at Halcyon London International School is GBP 41,040 - 42,912, based on the most recent published figures. Fees vary by grade level and additional services — confirm current fees with the school before applying.

Halcyon London International School is located at 33 Seymour Place, London W1H 5AU, in the Marylebone area of London.

You can request information about Halcyon London International School's admission process by filling out the inquiry form on this page. Our team will connect you with the school's admissions office.