Great Walstead School is a private day school for girls and boys between the ages of 2½ and 13 years with a Christian ethos.

The school is set in 265 acres (1.07 km2) of grounds just a mile and a half from the village of Lindfield, West Sussex in the countryside and has extensive playing fields and woodlands.

The school was founded in 1925 by Robert James Mowll (1895–1963),[4][5] the last Baron Mowll of the Cinque Ports.

It was originally situated at Enfield, north London and known as Kilvinton Hall school.

Headmasters since Mr Mowll have been Gordon Parke (1960),[6] Nick Bawtree (1986), Hugh Lowries (1991), the Reverend Jeremy Sykes (2006), Colin Baty (2010) and Chris Calvey (2017) In 2003, a staff member was detained under Operation Ore.[7]