William Jardine may refer to:
William Jardine (merchant), Scottish surgeon and merchant, one of the founders of Jardine, Matheson & Co. Sir William Jardine, 7th Baronet (1800–1874), Scottish naturalist William Marion Jardine (1879–1959), U.S. secretary of agriculture (1925–1929), U.S. ambassador to Egypt (1930–1933) Sir William Murray Jardine, 13th Baronet (born 1984), chief of Clan Jardine William Jardine, editor of the Farmers' Almanac
See also William Jardine Smith, Australian writer