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

He was the son of William Kerr, 4th Marquess of Lothian and Lady Caroline D'Arcy (daughter of the 3rd Earl of Holderness and a scion of the House of Schomberg).

[2] He married Elizabeth Fortescue, daughter of Chichester Fortescue of Dromisken, County Louth, and Elizabeth (née Wesley), on 15 July 1762.

[1] They had nine children: He was buried at St Andrew's parish Church, Farnham, Surrey on 19 January 1815.

This biography of a marquess in the peerage of Scotland is a stub.