| Honorific Prefix: | The Right Honourable |
| The Earl of Dundonald | |
| Birth Name: | Thomas Cochrane |
| Birth Date: | 1702 |
| Death Place: | Paisley Abbey |
| Parents: | William Cochrane Lady Grizel Graham |
| Children: | William Cochrane, 7th Earl of Dundonald |
| Relations: | James Graham, 2nd Marquess of Montrose (grandfather) |
Thomas Cochrane, 6th Earl of Dundonald (1702 - 28 May 1737) was a Scottish aristocrat.
Cochrane was born in 1702. He was the second but only surviving son of William Cochrane of Kilmaronock, MP for Wigtown Burghs, and the former Lady Grizel Graham.[1]
His paternal grandparents were William Cochrane, Lord Cochrane and his wife Lady Katherine Kennedy (a daughter of John Kennedy, 6th Earl of Cassilis). His maternal grandparents were James Graham, 2nd Marquess of Montrose and the former Lady Isabel Ker (widow of Robert Ker, 1st Earl of Roxburghe, and fifth daughter of William Douglas, 7th Earl of Morton).[2]
Upon the death of his unmarried cousin, William Cochrane, 5th Earl of Dundonald, in 1725, he inherited the earldom of Dundonald.[1]
In October 1727, Lord Dundonald was married to Catherine Hamilton (d. 1779), the second daughter of Lord Basil Hamilton of Baldoon (sixth son of William Hamilton, Duke of Hamilton and Anne Hamilton, suo jure Duchess of Hamilton) and the former Mary Dunbar (a daughter of David Dunbar the Younger of Baldoon, who was the granddaughter and heiress of Sir David Dunbar, 1st Baronet, of Baldoon).[1] Together, they were the parents of:
Lord Dundonald died at Paisley Abbey on 28 May 1737,[1] and was succeeded in his titles by his eldest son, William. His widow died on 13 April 1779. On the death of his unmarried heir in 1758, his line died out and the title was inherited by his son's second cousin, Thomas Cochrane.[5]