William Macartney may refer to:
William Macartney (1714–1793), MP for Belfast Sir William Isaac Macartney, 2nd Baronet (1780–1867), of the Macartney baronets William Ellison-Macartney (1852–1924) Sir William Isaac Macartney, 4th Baronet (1867–1942), of the Macartney baronets
See also William McCartney (disambiguation)