An international school with a family approach

British international school

From Primary to A Levels

In the heart of Cascais, Lisbon

Personalised support at every stage of learning

Primary School

Ages 2-11 Campus I - Monte Estoril

Where curiosity is sparked and foundations are built for life. We nurture every child in a warm, safe environment where learning feels like play and every small step is celebrated.

Know more

Middle School

Ages 11-16 Campus II - Monte Estoril

A crucial period of growth, handled with care. We support pupils through the transition into adolescence, helping them discover their strengths, deepen their knowledge, and build the confidence to thrive.

Know more

Upper School

Ages 16-19 Campus III - Monte Estoril

The pathways to top universities start here, with rigorous Cambridge A-Level|AICE Diploma and IGCSE programmes, personalised guidance and a strong record of results, our pupils are ready to meet the world.

Know more

Why Choose SAIS

Personalised Learning

Personalised support at every stage of the learning journey
Family Environment

A close, caring community where every child belongs
Cambridge Pathway

From Primary through to A-Levels|AICE Diploma
Academic Excellence

Strong results and progression to top universities worldwide

Small enough to know you. Strong enough to guide you.

What our community says

"Leading alongside this team from the very beginning has shown me what a school can be when everyone truly believes in what they are doing."

Mrs. Sofia Aguiar

founding member/Senior Leader since 2012

"SAIS is like a second home, where I also learn a lot from my students every day."

Mrs. Mariana Olazabal

Maths Teacher, since 2013

"SAIS is a unique school where teachers work together in a healthy environment and this is reflected in the individual education of every student."

Mrs. Tones Safont

A-Level Spanish Teacher, since 2014

"This is my first year at Santo António International School, and it has been a truly unforgettable experience. From the very beginning, I felt welcomed into a community full of kindness, support and genuine care. Being part of a school where so many different cultures come together has been really inspiring. At SAIS, I feel that education is not only about learning, but also about belonging, connection and helping children feel safe, confident and valued. I feel very grateful to be part of such a special community."

Mrs. Raquel Leandro

Middle School Portuguese Teacher, mother of one

"As a mother, what I appreciate most is the genuine care and connection my child feels every day at school. Seeing children encouraged to discover their strengths, support one another, and proudly represent their community creates an environment where they truly feel happy, valued, and inspired to grow."

Mrs. Vera Neves

Mother of Pedro Neves, founding member at SAIS

When I entered the building of SAIS for the first time, I had the feeling immediately that I arrived home. The natural and kind hospitality of the staff, the reinforcing and wise personality of the director, the positive and caring attitude of every staff member who work in SAIS helped us to build a better and safer future for our children. We are grateful for SAIS with all our hearts and we wish a very bright future for the institution!

Mrs. Eszter Hajdu

Mother of three from Hungary

"SAIS is the place where every day at 16.00, I have to spend 30 minutes fighting my children to get them to come home with me. They literally don't want to leave."

Gerritsen family

Family of 2 from Nederland

Learning for life, not for school. SAIS is a space where children discover the joy of personal growth and learn for their own future.

Drebot Family

Family of 5 from Polland

What I love most about SAIS is how genuinely happy the students are here. It’s a place where they feel known, and that makes all the difference in how they learn.

Emma Slater

English Teacher, Head of Team since 2020