Colonel Alexander Abercromby, CB (4 March 1784 – 27 August 1853) was a senior British Army officer during the Napoleonic Wars.

[1] Born on 4 March 1784,[2] Abercromby entered the army at an early age, and served as a volunteer with the 92nd Regiment in the expedition to the Helder in 1799.

He was appointed aide-de-camp to his father's old lieutenant and friend, Sir John Moore, during his command in Sicily in 1806, but was not with him in Spain.

[1] For his active services he was promoted to a colonelcy in the 2nd or Coldstream Guards, and made a companion of the Bath, a knight of the order of Maria Theresa of Austria, of the Tower and Sword of Portugal, and of St. George of Russia.

He was returned to parliament in the Whig interest in 1817 for the county of Clackmannan in place of his brother Sir John, but retired next year.