| Honorific Prefix: | The Right Honourable |
| The Earl of Carnwath | |
| Birth Date: | 13 February 1768 |
| Allegiance: | United Kingdom |
| Branch: | British Army |
| Serviceyears: | 1798–1839 |
| Rank: | Lieutenant-general |
| Unit: | 1st Foot Guards 60th Regiment of Foot |
| Battles: | |
| Spouse: | |
| Children: | 14 |
Lieutenant-General Robert Alexander Dalzell, 6th Earl of Carnwath (13 February 1768 – 1 January 1839), was a Scottish nobleman and soldier.[1]
Carnwath was the son of Robert Dalzell (1738−1788) (himself the son of Robert Dalzell, 5th Earl of Carnwath) and Elizabeth Acklom. He was married three times.[2] He married, firstly, Jane Parkes, daughter of Samuel Parkes, on 23 September 1789. They had one daughter, Elizabeth Dalzell (1790−1801). He married, secondly, Andalusia Browne, daughter of Lieutenant-Colonel Arthur Browne, on 26 April 1794. They had the following children together:
Carnwath married finally, Jane Morrison Carnell, daughter of John Carnell, on 11 October 1838.
The titles of Earl of Carnwath, Lord Dalzell and Liberton and the Dalzell baronetcy of Glenae had been forfeited by a Writ of Attainder for treason for the fifth Earl's support of the Jacobite cause in an unsuccessful rebellion in 1715 known as the Fifteen or Lord Mar's Revolt. Lieutenant-General Dalzell was to have the attainder reversed by Act of Parliament on 26 May 1826, thereby having his grandfather's titles restored to him.[3]
Carnwath died on 1 January 1839 aged 70, and was succeeded in his titles by his son, Thomas Dalzell.