John Lyon, 9th Earl of Strathmore and Kinghorne was born 17 July 1737 in West Rainton, County Durham, England, United Kingdom to Thomas Lyon, 8th Earl of Strathmore and Kinghorne (1704-1753) and Jean Nicholson (1713-1778) and died 7 March 1776 ship to Portugal of tuberculosis. He married Mary Eleanor Bowes (1749-1800) 24 February 1767 in Houghton-le-Spring, County Durham, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Mary Lyon (1768-1806) | |||
| John Bowes, 10th Earl of Strathmore and Kinghorne (1769-1820) | 14 April 1769 | 3 July 1820 | Mary Milner (-1860) |
| George Bowes-Lyon (1771-1806) | |||
| Thomas Lyon-Bowes, 11th Earl of Strathmore and Kinghorne (1773-1846) | 3 May 1773 | 27 August 1846 Holyrood House, Midlothian, Scotland, United Kingdom | Mary Elizabeth Louisa Rodney Carpenter (1783-1811) Eliza Northcote (c1775-?) Marianne Cheape (1772-1849) |
| Anna Maria Lyon (c1774-1832) | |||
Footnotes (including sources)
| ‡ General |