Lieutenant-General Alexander Irvine or Irwin (died 1752) was a British Army officer. On 1 October 1689 he entered the Army as an ensign in the 2nd Battalion of the Royal Regiment of Foot. He was made adjutant of the 1st Battalion on 22 May 1694 and promoted to captain on 2 October 1695, when serving with the regiment before Namur; his commission was renewed in 1702. In 1704 he was wounded at the Battle of Schellenberg, and he was promoted to major on 3 August that year. Irwin served as a brigade-major at the Battle of Blenheim, where he was again wounded, and was later present at Ramillies and Malplaquet. He was granted brevet rank as a colonel on 1 March 1711.