Merlin Hay, 24th Earl of Erroll
| The Earl of Erroll | |
|---|---|
| Official portrait, 2018 | |
| Member of the House of Lords | |
| as an elected hereditary peer 11 November 1999 | |
| Election | 1999 | 
| Preceded by | Seat established | 
| as a hereditary peer 16 May 1978 – 11 November 1999 | |
| Preceded by | The 23rd Countess of Erroll | 
| Succeeded by | Seat abolished | 
| Lord High Constable of Scotland Chief of Clan Hay | |
| Assumed office 16 May 1978 | |
| Preceded by | The 23rd Countess of Erroll | 
| Personal details | |
| Born | Merlin Sereld Victor Gilbert Hay 20 April 1948 | 
| Spouse | Isabelle Astell  (m. 1982; died 2020) | 
| Children | 4 | 
| Parents | 
 | 
| Residence(s) | Woodbury Hall, Sandy, Bedfordshire | 
| Occupation | Programmer | 
Merlin Sereld Victor Gilbert Hay, 24th Earl of Erroll (born 20 April 1948), is a crossbench member of the House of Lords, chief of the Scottish clan Hay, and hereditary Lord High Constable of Scotland.