Marymount International School London

Marymount London is an all-girls Catholic IB day and boarding school founded in 1955 by the Religious of the Sacred Heart of Mary, on a leafy George Road campus in Kingston upon Thames. Around 240 girls aged 11 to 18 with about 50 boarders.

Marymount was the first UK school to fully adopt the IB, runs the MYP and Diploma, and sits in the top 5 percent globally for IB outcomes. The 2025 Diploma average was 37 points, a quarter scoring 40 or more and a third taking the bilingual diploma. Day fees sit around GBP 39,500 to GBP 67,000 in 2025/26, sharply higher than local peers.

Families describe a school that feels like family, strong pastoral care, an outstanding learning support team, and a Catholic ethos that flavours the day without dominating it. The IB lands many girls in leading US universities. The honest comment is the transient population, which can unsettle long-term pupils. Best fit for internationally mobile or academically ambitious girls drawn to the IB and a faith-based community.

• All-girls IB day and boarding school in Kingston upon Thames, run on Catholic ethos. Last full ISI inspection in 2015 rated the school excellent in all areas.
• IB outcomes are the academic anchor parents cite. One parent said 'the IB got both girls into leading US universities'.
• Repeat parent praise for small classes, individual attention and the campus. Multiple reviewers describe the small-school feel; one said it 'feels like family'.
• Two recurring tensions show up across Mumsnet, Good Schools Guide and ischooladvisor: fees are high (around £9k per term for day students) and the population is transient, which can unsettle long-term pupils.
• Negative reviews on aggregator sites are a minority but specific. One parent said they would not recommend the school. Boarding staff are described in some reviews as rude or too strict.