Sir John Vaughan PC  ‎(11 February 1768 - 25 September 1839)‎ was an English judge.

Vaughan was born at Leicester, the third but second surviving son of Dr. James Vaughan a physician at Leicester, and his wife, Hester née Smalley. He was called to the bar in June 1791. In 1816 he became King's Serjeant and in 1827 he became Baron of the Exchequer. He was knighted on 24 November 1828. In 1834 he became Justice of the Court of Common Pleas and was made a Privy Councillor.

Vaughan died at Eastbury Lodge, near Watford, Hertfordshire at the age of 71.

Vaughan married firstly Hon. Augusta St John, daughter of Henry Beauchamp St John, 13th Baron St John on 20 December 1803. They had six children but she died on 30 January 1813. He married secondly Lady Louisa St John, widow of St Andrew St John, 14th Baron St John of Bletso

St Andrew St John, 14th Baron St John of Bletso

St Andrew St John, 14th Baron St John of Bletso PC FRS was an English politician who sat in the British House of Commons from 1780 until 1806 when he inherited a peerage....

 and daughter of Sir Charles William Rouse-Boughton, 9th Baronet on 4 August 1823 and had a son and daughter.

Vaughan and his first wife had issue, including a son Sir (Henry) Halford Vaughan

Henry Halford Vaughan

Sir Henry Halford Vaughan, or Halford Vaughan was an English historian, Regius Professor of History at Oxford University, 1848-1858. The son of Sir John Vaughan . His own son was the educationalist William Wyamar Vaughan- External links :**...

 (27 August 1811-19 April 1885), Regius Professor of History at Oxford University

Regius Professor of Modern History (Oxford)

The Regius Professor of Modern History at the University of Oxford is an old-established professorial position. The first appointment was made in 1724...

 1848-1858 and father of William Wyamar Vaughan

William Wyamar Vaughan

William Wyamar Vaughan was a British educationalist.Vaughan was the son of Sir Henry Halford Vaughan, Regius Professor of Modern History at Oxford. In 1898 he married Margaret Symmonds, daughter of John Addington Symonds; they had two sons and a daughter. Their daughter was noted physiologist,...

 (1865-4 February 1938) a British educationalist. His daughters were Augusta Vaughan (5 May 1805 - 12 August 1880) and Barbara Vaughan (26 July 1806 - 24 June 1869) who married her cousin Sir Henry Halford, 2nd Baronet

Sir Henry Halford, 2nd Baronet

Sir Henry Halford, 2nd Baronet was an English Tory and later Conservative politician who sat in the House of Commons from 1832 to 1857.Halford was the son of Sir Henry Halford, 1st Baronet and his wife Hon...

. Vaughan and his second wife had issue Emily Vaughan who married Sir Charles Isham, 10th Baronet and Rev. Charles Lyndhurst Vaughan.