David Stuart Erskine, 11th Earl of Buchan, FRS, FSA Scot (1 June 1742 – 19 April 1829), styled Lord Cardross between 1747 and 1767, was a Scottish antiquarian, founder of the Society of Antiquaries of Scotland, and patron of the arts and sciences.

[7] A supporter of the American cause, he corresponded with George Washington and sent him a box made from the oak that hid William Wallace after the Battle of Falkirk.

As he outlined in a letter of November 1780 he wished to create a body to promote antiquarian researches in that part of Great Britain.

[12] Spending much of his later time at Dryburgh House he embellished the grounds with monuments including commemorations of his ancestors and of Robert Burns and William Wallace.

[citation needed] In later years he became increasingly eccentric a trait which tended to obscure his talents, as was noted by Sir Walter Scott.

[13] After the earl's death "when he was put into the family burial-ground, at Dryburgh, his head was laid the wrong way, [to] which Sir Walter Scott said was little matter, as it had never been quite right in his lifetime.

There is an interesting story concerning the Earl in which the writer George Dyer brought him to meet Charles Lamb at his flat in Mitre Court Buildings.