Hugh D. Auchincloss, Jr. (1897 – 1976) was an American merchant and businessman who was the step-father of First Lady Jackie Bouvier Kennedy. Hugh Auchincloss may also refer to: Hugh Auchincloss (immunologist) (born 1949), American immunologist Hugh D. Auchincloss (merchant) (1858–1913), American merchant and businessman See also Hugh Auchincloss Brown (1879–1975), electrical engineer Hugh Auchincloss Steers (1962–1995), American painter