The Duke of Roxburghe | |
|---|---|
| Born | 23 April 1740 |
| Died | March 19, 1804(1804-03-19) (aged 63) London, UK |
| Parent(s) | Robert Ker, 2nd Duke of Roxburghe Essex Mostyn |
| Signature | |
John Ker, 3rd Duke of Roxburghe, KG, KT, PC (23 April 1740 – 19 March 1804) was a Scottish courtier.