James Hamilton, 2nd Duke of Abercorn, KG, CB, PC (Ire) (24 August 1838 – 3 January 1913), styled Viscount Hamilton until 1868 and Marquess of Hamilton from 1868 to 1885, was a British nobleman and diplomat. He was the son of James Hamilton, 1st Duke of Abercorn, and Lady Louisa Jane Russell.