Hugh Dudley Auchincloss was born 8 July 1858 in Newport, Newport County, Rhode Island, United States to John L. Auchincloss (1810-1876) and Elizabeth Buck (1816-1902) and died 21 April 1913 New York City, New York County, New York, United States of unspecified causes. He married Emma Brewster Jennings (1861-1942) 19 November 1891 in New York City, New York County, New York, United States.
Children
| Name | Birth | Death | Joined with |
| Esther Judson Auchincloss (c1890-) | |||
| Ann Burr Auchincloss (c1894-) | |||
| Hugh Dudley Auchincloss (1897-1976) | |||
Siblings
| Name | Birth | Death | Joined with |
| Henry Buck Auchincloss (1836-1926) | |||
| Sarah Ann Auchincloss (1838-1887) | |||
| John Stuart Auchincloss (1840-1842) | |||
| William Stuart Auchincloss (1842-1928) | |||
| Edgar Stirling Auchincloss (1847-1892) | 29 September 1847 New York City, New York County, New York, United States | 13 March 1892 New York City, New York County, New York, United States | Maria LaGrange Sloan (1847-1929) |
| Frederick Lawton Auchincloss (1851-1878) | |||
| John Winthrop Auchincloss (1853-1938) | 12 April 1853 New York City, New York County, New York, United States | 24 January 1938 Manhattan, New York County, New York, United States | Joanna Hone Russell (1856-1933) |
| Hugh Dudley Auchincloss (1858-1913) | 8 July 1858 Newport, Newport County, Rhode Island, United States | 21 April 1913 New York City, New York County, New York, United States | Emma Brewster Jennings (1861-1942) |