Sir Jermyn Davers, 4th Baronet (c.1686 – 20 February 1743), of Rougham and Rushbrooke, Suffolk, was an English landowner and Tory politician who sat in the House of Commons from 1722 to 1743.^[1]

Davers was the second son of Sir Robert Davers, 2nd Baronet and his wife, Hon. Mary Jermyn, daughter and co-heiress of Thomas Jermyn, 2nd Baron Jermyn.^[1][2] He was brought up at Rushbrooke Hall and matriculated at Christ Church, Oxford on 14 March 1704, aged 17.^[3]

At the 1722 British general election, Davers was returned in a contest as a Tory Member of Parliament for Bury St Edmunds.^[1] He succeeded his brother Sir Robert Davers, 3rd Baronet, to the baronetcy on 20 May 1723.^[2] In April 1725, he was one of five Tories who voted against a motion to restore the inheritance of Bolingbroke. He inherited a share of the Jermyn estates, including Cheveley, Cambridgeshire, and Dover Street, London, in 1726 from his great-uncle, Henry Jermyn, 1st Baron Dover, who had died in 1708 without a male heir.^[1][4] At the 1727 British general election, he was returned as MP for Suffolk, topping the poll in a contest. He voted consistently against the government.

In 1730 he and his brother, Thomas, sold two estates (and the enslaved people attached to them) on Barbados to the Frere family.^[5] He had inherited the holdings from his father. He was returned unopposed for Suffolk in 1734 British general election and 1741 British general election.^[6]

Davers appear to have had two illegitimate sons before his marriage to Margaretta Green, the daughter of Rev. Edward Green, rector of Drinkstone, Suffolk, on 21 October 1729.^[2] He died on 20 February 1743, leaving in addition four legitimate sons of whom two shot themselves, and two daughters:^[6]

• Mary Davers (1730–1805)
• Charles Davers (died young)
• Elizabeth Davers (1733 – 19 December 1800), married Frederick Hervey, 4th Earl of Bristol
• Sir Robert Davers, 5th Baronet (1735 – 6 May 1763), unmarried
• Lt. Henry Davers, RN (d. 1759), shot himself on board HMS Neptune
• Sir Charles Davers, 6th Baronet (4 June 1737 – 4 June 1806)
• Rev. Thomas Davers (1738–1766)

He was succeeded in the baronetcy by his son Robert who was killed in Canada during Pontiac's Rebellion and then, by Charles.^[1]