John Thornhagh

John Thornhagh (1648–1723), of Fenton and Osberton, Nottinghamshire, was an English Whig politician who sat in the English and British House of Commons between 1689 and 1710.

Thornhagh was baptized on 27 January 1648 at St Mary's Nottingham, the only son of Francis Thornhagh, MP for East Retford and his wife Elizabeth St Andrew, daughter of John St Andrew of Gotham, Nottinghamshire. He succeeded his father in 1648. He was admitted at Jesus College, Cambridge on 1 June 1664. He married Elizabeth Earle, the daughter of Sir Richard Earle, 1st Baronet, of Stragglethorpe, Lincolnshire, on 15 September 1670.

Thornhagh was Commissioner for assessment for Nottinghamshire from 1673 to 1680. In February 1688, he was appointed a Justice of the Peace . He was High Sheriff of Nottinghamshire for the year 1688 to 1689 and was a Deputy Lieutenant for Nottinghamshire thereafter. At the 1689 English general election, he was elected Member of Parliament for East Retford as a Court candidate. He was moderately active in the convention, sitting on 21 committees.

Thornhagh was buried at Sturton, Nottinghamshire, on 17 May 1723. He had three sons and five daughters. He was succeeded by his son St Andrew Thornhagh.