St. Catherine's was established in 1956 in the grounds of the British Embassy in Athens. Although originally intended to provide education for children from Britain and the Commonwealth, it now teaches 1154 pupils, aged 3 to 18 years, from 54 nationalities. St. Catherine's is a 'not for profit organisation'. It is, however, a private school and is registered at Companies House in the UK. It is also registered as a charity with the UK Charities Commission.