Sir Alexander Don, 6th Baronet

Sir Alexander Don, 6th baronet (1780–1826), of Newton Don, Berwick, was an officer in the British Army and a Member of Parliament (M.P.) for Roxburghshire from 1814 until 1826.

Alexander was baptised on 5 May 1780. He was the oldest son of Sir Alexander Don, 5th Baronet, and Lady Harriet Cunningham, daughter of William, 13th Earl of Glencairn.

He was a captain in the Roxburgh militia in 1802 and in the Berwick Yeoman Cavalry from 1810 until 1813. He served as captain in the Roxburgh Yeomanry from 1814 and was promoted to major in 1821.

As a pro-Catholic Tory, he was returned for Roxburghshire on the Buccleuch interest on 25 July 1814 (at his second attempt) and represented that constituency until 11 April 1826. He attended the Parliament erratically and made no major speeches.

Sir Alexander married first in 1809, Lucretia (died 1817), daughter of George Montgomerie (formerly Molineux) of Garboldisham Hall, Norfolk. She died without any surviving children. Sir Alexander married secondly in 1824 Grace Jane (died 1878), daughter of John Stein, distiller, of Herriot Row, Edinburgh. They had no children, however from a previous marriage Grace had two children: Sir William Henry Don, 7th Baronet, the actor; and Alexina Harriet.