John Dury (1596 in Edinburgh – 1680 in Kassel) was a Scottish Calvinist minister and an intellectual of the English Civil War period. He made efforts to re-unite the Calvinist and Lutheran wings of Protestantism, hoping to succeed when he moved to Kassel in 1661, but he did not accomplish this. He was also a preacher, pamphleteer, and writer.

He was the fourth son of the exiled Scottish presbyterian minister Robert Durie; John was brought up in the Netherlands, at Leiden, attending the university there. He was in Cologne, at the Walloon Church, 1624-6, and subsequently at Elbląg (Elbing). He was a close associate of Samuel Hartlib, a native of Elbląg, whom he met there, and shared his interest in education. According to Richard Popkin, another key influence was Joseph Mede, from whom Dury took a method of scriptural interpretation; this interpretation has been challenged by recent research claiming that Dury developed his "Scriptural Analysis" before meeting with the works of Mede. While at Elbing he translated an anti-trinitarian work of Samuel Przypkowski into English.

From 1628 Dury petitioned Gustavus Adolphus for help in the cause of Protestant unity. He spent much time from 1630 to 1661 wandering through Europe, working for ecclesiastical peace between Calvinists and Lutherans. Through an introduction from Hartlib, he also met Comenius, who spent some years in Elbing as well.

Up to 1633, Dury had Anglican support from George Abbot. In that year, Abbot died and was replaced by William Laud, with whom Dury had a much more difficult relationship; Christopher Hill states "Laud had no use for the efforts of Comenius, Dury and Hartlib to reunite Protestants". Dury was ordained in 1634, and went to Sweden, supported by 38 English Puritans. The networking of Dury and Hartlib in the 1630s brought them close to Oliver Cromwell, through Oliver St John (a relation by marriage, and friend) and the Godmanchester preacher Walter Welles, a neighbour.

Dury then travelled widely in northern Europe, and was tutor to Mary, Princess of Orange in the Hague. He had a long though unproductive meeting with René Descartes in 1635; also in the Netherlands he was an associate of Adam Boreel and Petrus Serrarius, and an influential figure.

At a key moment in English and European politics, Dury in August 1641 published Concerning the Work of Peace Ecclesiastical, urging Protestants to unite across national boundaries. This work was dedicated to his patron Sir Thomas Rowe, and had been written in 1638. In 1639 Viscount Mandeville was writing to Dury, in the context that the situation in particular of German Protestants was being mooted and linked to the possibility of the English and Scottish churches could organise or broker such a union.

In 1641, Dury and Comenius came to England; an invitation had been mooted in a sermon by John Gauden in 1641, at the start of the Long Parliament. The backers of the scheme to bring Comenius then included John Pym and Lord Brooke as well as Mandeville.

Dury gave a well-known sermon to the Parliament on 26 November 1645, Israels Call to March out of Babylon into Jerusalem. He was given an official appointment, as tutor to the younger children of Charles I; from 1646 these had been in the care of Algernon Percy, 10th Earl of Northumberland.