Alexander John ("Jack") Mackenzie Stuart, Baron Mackenzie-Stuart (18 November 1924 – 1 April 2000) was a Scottish advocate and judge.
His parents were Prof A. Mackenzie Stuart, a King's Counsel and Professor of Scots Law at Aberdeen University, and Amy Margaret Dean.
After a short period studying the War Office Engineering Course at Sidney Sussex College, Cambridge, he was deployed throughout northern Europe on active service, mainly building bridges.
A staff post in Burma and a spell dismantling mines on the Northumbrian coast then followed, and it was only after the war was over that he returned to Cambridge on a law scholarship, taking first class honours in Part II of the Tripos in 1949, followed by an LL.B.
In those days there was no specialisation and he was equally at home in the realms of trusts (on which his father had written the standard textbook), taxation and estate duty (as Counsel to the Revenue) and coal-mining accidents.
They worked hard to build up the spirit of the embryo British community and his wife, Anne, became a driving force in the European School.
In recognition of his contribution to the work of the Court of Justice and to community law, he was created a Life Peer on 18 October 1988 as Baron Mackenzie-Stuart, of Dean in the district of the City of Edinburgh[4] (his peerage, unlike his surname and Scottish judicial title, was hyphenated).