John Bonar, the elder (1722–1761) was a Scottish minister.
He was born at Clackmannan on 4 November 1722; his father John Bonar was then tutor at Kennet and his mother was Jean Smith, daughter of William Smith of Clackmannan. His father was ordained minister of the united parishes of Fetlar and North Yell, in Shetland, in 1729, and he was sent to his grandfather's manse at Torphichen, Linlithgowshire. There he received a parish school education, and then went to the University of Edinburgh, where he matriculated 27 April 1742.
Bonar was licensed as a preacher of the gospel 5 June 1745, and ordained 22 August 1746 as the minister of the parish of Cockpen, near Dalkeith. In 1756 he received a presentation to the church of Jedburgh, from William Kerr, 4th Marquess of Lothian. He was unable to take it up, however, in the face of strong local opposition, from supporters of Thomas Boston; Boston was minister at Oxnam, just outside Jedburgh, and had the support of the Town Council. The Marquess's objection to the evangelical Boston was personal, rather than theological. and in the end John Douglas was nominated. Bonar was called to the second or collegiate church of Perth and settled there 29 July 1756.
Bonar died at Perth 21 December 1761, aged 39.
Bonar was known as a persuasive preacher on the old evangelical lines. In 1750 he printed anonymously Observations on the Conduct and Character of Judas Iscariot (reprinted in 1822); and in 1752 a prominemt sermon on the Nature and Necessity of Religious Education, which was preached before the Society in Scotland for Propagating Christian Knowledge.
In 1755 Bonar published anonymously An Analysis of the moral and religious Sentiments contained in the writings of Sopho (i.e. Lord Kames) and David Hume, Esq., addressed to the General Assembly of the Church of Scotland, a work that has sometimes been wrongly attributed to Rev. George Anderson. It was replied to angrily in Observations upon the Analysis, but never answered.