Nathaniel Whitney III was born 23 January 1695 in Watertown, Middlesex County, Massachusetts, United States to Nathaniel Whitney (1675-1730) and Mercy Robinson (1676-1740) and died 27 January 1776 Westborough, Worcester County, Massachusetts, United States of unspecified causes. He married Mary Child (1699-1776) 22 June 1721 in Weston, Middlesex County, Massachusetts, United States.
Children
| Name | Birth | Death | Joined with |
| Ephraim Whitney (1722-1797) | |||
| Oliver Whitney (1724-1804) | 1 December 1724 Westborough, Worcester County, Massachusetts | 18 May 1804 Upton, Worcester County, Massachusetts | Dorcas Forbush (1727-1811) |
| Mary Whitney (1727-) | |||
| Nathaniel Whitney (1728-1776) | |||
| Annah Whitney (1730-) | 8 March 1730 Westborough, Worcester County, Massachusetts | David Forbush (1721-1787) | |
| Amos Whitney (1732-) | |||
| Lucy Whitney (1734-1799) | |||
| Love Whitney (1736-) | |||
| Lois Whitney (1739-) | |||
| Eli Whitney (1740-1807) | 3 May 1740 Westborough, Worcester County, Massachusetts, United States | 12 August 1807 Westborough, Worcester County, Massachusetts, United States | Elizabeth Fay (1740-1777) Judith Morse (1737-c1826) |
Siblings
| Name | Birth | Death | Joined with |
| Nathaniel Whitney (1696-1728) | 23 January 1695 Watertown, Middlesex County, Massachusetts, United States | 27 January 1776 Westborough, Worcester County, Massachusetts, United States | Mary Child (1699-1776) |
| Samuel Whitney (1711-1788) | 17 June 1711 Watertown, Middlesex County, Massachusetts, United States | 2 August 1788 Shrewsbury, Worcester County, Massachusetts, United States | Elizabeth Hastings (1716-1800) |
| Solomon Whitney (-) | |||
Residences
Footnotes (including sources)
| ‡ General |