Alexander Montgomerie, 10th Earl of Eglinton

Alexander Montgomerie, 10th Earl of Eglinton (10 February 172325 October 1769), was a Scottish peer.

Eglinton was the son of The 9th Earl of Eglinton. His mother, who was the third wife of the 9th Earl, was Susanna, Countess of Eglinton, the society beauty. He was the Grand Master Mason of the Grand Lodge of Scotland from 1750 to 1751.

Lord Eglinton was one of the first of the Scottish landowners to carry out improvements on his estates. The Earl died from his abdominal wounds late that evening. Campbell was convicted of murder but died by his own hand before the sentence could be carried out.