George de Dunbar, 11th Earl of Dunbar & March Lord of Annandale and the Isle of Man, (c. 1370 – after 1457) was the last of his family to hold these titles.
He was aged about fifty when he succeeded his father, George de Dunbar, 10th Earl of March and Dunbar, (1340–1420). "George de Dunbarre son of the Earl of March" had a Safe-conduct to pass through England with twenty horsemen to go "beyond the seas" and return, dated 19 March 1399. In August 1405 he was Lieutenant of the castle of Cockburnspath, Berwickshire, and was engaged in various public transactions during his father's lifetime. In 1390 he obtained from King Robert II a grant of his ward-relief and marriage for the Earldom of March and lordship of Annandale; and he acted as a Commissioner for liberating from English captivity Murdoch, son of the Regent Albany, on 7 December 1411, and in 1415. "George de Dounbar, son and heir of the Earl of the Marches of Scotland" had a further Safe-conduct, with numerous other nobles to travel to England between 1416-1419.
On 19 August 1423 "George, Earl of March" and his brother Sir Patrick de Dunbar of Beil were named as part of the illustrious embassy sent to negotiate the liberation of King James I of Scotland who had long been a captive in England.
On 28 March 1424, the Earl of March was one of the Conservators of the seven-year truce with England, and had the honour of meeting James I and his consort at Durham upon their return to Scotland. He was also present at their Coronation in Scone on 24 May 1424, when he was knighted.
However the following year the earls of Dunbar and Douglas, with the Duke of Albany, and twenty other feudal barons, were suddenly arrested and confined by order of parliament after accusations of corruption in Scottish affairs during James's absence. Albany and his sons, with his father-in-law the Earl of Lennox were beheaded, but the Earl of Dunbar and most of the other barons were set at liberty, their guilt being less apparent.