Alexander Montgomerie, 10th Earl of Eglinton (10 February 1723 – 25 October 1769), was a Scottish peer.

His mother, who was the third wife of the 9th Earl, was Susanna, Countess of Eglinton, the society beauty.

Lord Eglinton was one of the first of the Scottish landowners to carry out improvements on his estates.

The Earl was shot on the beach near his own estate of Ardrossan by an excise officer or Gaudger (Scots) named Mungo Campbell on 24 October 1769 following a dispute about the latter's right to bear arms on the Earl's grounds.

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