William Hay, 5th Earl of Erroll

The Right Honourable The Earl of Erroll
Arms of the Earl of Erroll
9th Lord High Constable of Scotland
In office 1513–1522
Preceded by	William Hay
Succeeded by	William Hay
Personal details
Born	c. 1495 Errol, Perthshire, Scotland
Died	28 July 1522 (age 26 or 27) Edinburgh, Scotland
Spouse(s)	Elizabeth Ruthven

William Hay, 5th Earl of Erroll (c. 1495 – 28 July 1522) was a Scottish peer and statesman.

William Hay was the son of the fourth Earl of Erroll. He had double royal lineage, descended from Kings Robert II of Scotland and James I of Scotland.

He inherited the earldom on 20 October 1513, aged approximately 18. In his role as Lord High Constable of Scotland, the young earl was sent as a commissioner to France in 1515 and to England in 1516.

He married Elizabeth, youngest daughter of William Ruthven, 1st Lord Ruthven, and had one son:

He died on 28 July 1522, not yet 30 years old. As his son died under aged 21, the lands of Errol, Perthshire were held by the crown until the end of 1541, when the grandson of the third earl inherited the title.