The English Schools Foundation (ESF) is an organisation that runs 22 international schools in Hong Kong. It is Hong Kong's largest English-medium organisation of international schools. It was founded in 1967 with the passage of the English Schools Foundation Ordinance.

Samples of potable water in Hong Kong were found to contain excessive levels of heavy metals including lead, nickel and cadmium in 2015. Such discoveries of contamination caused widespread crisis within the city.