Cosmo George Gordon, 3rd Duke of Gordon KT (27 April 1720 – 5 August 1752), styled Marquess of Huntly until 1728, was a Scottish peer.

Gordon was the son of the 2nd Duke of Gordon and was named after his father's close Jacobite friend, Cosimo, Grand Duke of Tuscany.

He sat in the House of Lords as a Scottish representative peer from 1747 to 1752.

Gordon married Lady Catherine Gordon (1718 – 10 December 1779), daughter of William, Earl of Aberdeen, on 3 September 1741.

This biography of a duke or duchess in the peerage of Scotland is a stub.