John William Robert Kerr, 7th Marquess of Lothian PC (1 February 1794 – 14 November 1841), styled Lord Newbottle until 1815 and Earl of Ancram from 1815 to 1824, was a Tory politician.

He served briefly as Captain of the Yeomen of the Guard under Sir Robert Peel between September and November 1841.

Styled Lord Newbottle from birth, he became known by the courtesy title Earl of Ancram when his father succeeded to the marquessate in 1815.

[1] Lord Ancram entered the House of Commons in 1820 as one of two representatives for Huntingdon, a seat he held until he succeeded his father in the marquessate in 1824.

[3] In September 1841 he was sworn of the Privy Council[4] and appointed Captain of the Yeomen of the Guard in the Tory administration of Sir Robert Peel, a post he held until his early death in November of the same year.