General William Henry Kerr, 4th Marquess of Lothian KT (1710 – 12 April 1775) was a Scottish nobleman, British soldier and politician, the eldest son of William Kerr, 3rd Marquess of Lothian. He was styled Master of Jedburgh until 1722, Lord Jedburgh from 1722 to 1735, and Earl of Ancram from 1735 to 1767. As the Earl of Ancram, he distinguished himself during the War of the Austrian Succession.