| Honorific-Prefix: | The Right Honourable |
| The Earl of Erroll | |
| Birth Date: | 1521 |
| Birth Place: | Edinburgh, Scotland |
| Death Date: | 11 April 1541 (age 19 or 20) |
| Death Place: | Edinburgh, Scotland |
| Office: | 10th Lord High Constable of Scotland |
| Predecessor: | William Hay |
| Successor: | George Hay |
| Term Start: | 1521 |
| Term End: | 1541 |
| Spouse: | Lady Helen Stewart |
| Children: | Lady Jean Hay |
| Parents: | William Hay, 5th Earl of Erroll Elizabeth Ruthven |
William Hay, 6th Earl of Erroll (1521 – 11 April 1541), styled as Lord Hay until age 1, was a Scottish peer.
William Hay was the son of the William Hay, 5th Earl of Erroll. He had double royal lineage, descended from Kings Robert II of Scotland and James I of Scotland.[1] [2]
He inherited the titles in 1522 at just a year old. As he died under the age of 21, the barony of Errol, Perthshire, were held by the crown all his life.[2]
William Hay married Lady Helen (whose name also appears as "Elenor" and "Helenor") Stewart, eldest daughter of John Stewart, 3rd Earl of Lennox. They had one daughter:
The Earl of Erroll died on 11 April 1541, in Edinburgh, being under 21 years of age. His wife Helen later remarried John Gordon, 11th Earl of Sutherland.
Six months after his death, the earldom and barony were restored to his cousin, George Hay, the grandson of William Hay, 3rd Earl of Erroll.[2]
Volume 3
. 1906. D. Douglas. 568. Balfour Paul.