In 1975 it was closed, and its final buildings were re-used for the new St John's Marlborough comprehensive school.

The Dissolution of Colleges Act 1547 closed all of the Kingdom of England's chantries, including the Hospital of St John, Marlborough.

The town's burgesses then petitioned the Crown for the hospital to be converted into a "'Free-scole for the inducement of youth", and by letters patent dated 18 October 1550 a grammar school was established.

[2][3] The former hospital thus became the school's first home, but in 1578 it was demolished and a new building was erected which provided a schoolroom, a house for the schoolmaster, and dormitories.

[2] A larger site to the south of the town was bought in 1936, but war and the subsequent restrictions prevented any building work there.