James Thorne Erskine, 14th Earl of Mar and 16th Earl of Kellie, DL (born 10 March 1949) is a British peer and Liberal Democrat member of the House of Lords.
Educated at Eton, he was Page of Honour to Queen Elizabeth II in 1962 and 1963. He proceeded to Moray House College of Education, Edinburgh, before embarking on a career in social work with various Scottish local authorities. He has also worked as a boatbuilder, and has served with the Royal Auxiliary Air Force and Royal Naval Auxiliary Service.
The earl entered the House of Lords in 1994, having succeeded to the title in the previous year, taking his seat on the Liberal Democrat benches. He lost his seat after the passage of the House of Lords Act 1999. However, in 2000, he was created a life peer as Baron Erskine of Alloa Tower, of Alloa in the County of Clackmannanshire, enabling him to return to the House. He was the Liberal Democrat candidate for the constituency of Ochil in the Scottish Parliament election, 1999.
As the 16th Viscount Fentoun, he is Premier Viscount of Scotland. He is also Chief of the Name and Arms of Erskine. Since 1991, he has been a Deputy Lieutenant of Clackmannanshire.