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International School of London

139 Gunnersbury Avenue, London, W3 8LG

Independent school for ages 3–18 in London. Mixed intake.

International School of London is a mixed independent school in London, within Hounslow, for pupils aged 3 to 18. It has nursery classes, a sixth form, around 400 pupils and a non-selective admissions policy. Ofsted rated the school Good in February 2024, and its independent school standards were recorded as met.

The school says it offers the academic rigour of the International Baccalaureate curriculum for children aged 3 to 18, while also noting candidate status for the IB Career-related Programme, which does not guarantee authorisation. It describes a warm, welcoming community, personalised learning and an international approach intended to develop curious, confident and globally minded pupils.

Ages 3–18 · All-through
397 pupils · On roll
Independent school · Mixed

Open days and visits at International School of London

Verified on the school’s website

Dates below were read from the school’s own pages. Use the source link to check the latest details.

  • Open evening
    Thursday 15 October 2026
    isllondon.org last checked 11 September
  • School tourNo date publishedBooking required
    isllondon.org last checked 11 September

    Nothing to add to your plan yet — once you’ve booked, put your own date on this route.

Primary applications close on 15 January 2027; secondary applications close on 31 October 2026. Sign in and create a planner to keep the deadline and school visits together. See Hounslow’s deadlines and how to apply →