William Kerr, 5th Marquess of Lothian

General William John Kerr, 5th Marquess of Lothian KT (13 March 1737 – 4 January 1815) was a British soldier and peer, styled Lord Newbottle until 1767 and Earl of Ancram from 1767 to 1775.

He was the son of William Kerr, 4th Marquess of Lothian and succeeded to the title in 1775.

He married Elizabeth Fortescue, daughter of Chichester Fortescue of Dromisken, Co. Louth and Elizabeth (née Wesley), on 15 July 1762. They had nine children:


 * William Kerr, 6th Marquess of Lothian (4 October 1763 – 27 April 1824)
 * Lady Elizabeth Kerr (2 September 1765 – 13 August 1822), married John Dormer, 10th Baron Dormer, without issue
 * Lady Caroline Sidney Kerr (8 September 1766 – 24 January 1829)
 * Lady Mary Kerr (5 December 1767 – 6 February 1791), married Gen. Hon. Frederick St John and had issue
 * Lady Louisa Kerr (30 November 1768 – 23 June 1819), who married Arthur Atherley on 2 June 1793 and had issue
 * Lady Harriet Kerr (b. 12 October 1770; died young)
 * Lord Charles Beauchamp Kerr (19 July 1775 – 2 March 1816), married Elizabeth Crump (d. 1830) and had issue
 * Vice-Admiral Lord Mark Robert Kerr (12 November 1776 – 9 September 1840), married Charlotte Macdonnell, suo jure Countess of Antrim, and had issue
 * Maj.-Gen. Lord Robert Kerr (14 September 1780 – 23 June 1843), married Mary Gilbert (d. 1861) and had issue