| Adam Hay | |
| Constituency Mp: | Peeblesshire |
| Parliament: | United Kingdom |
| Term Start: | 1767 |
| Term End: | 1768 |
| Predecessor: | John Dickson |
| Successor: | James William Montgomery |
| Constituency Mp2: | Peeblesshire |
| Parliament2: | United Kingdom |
| Term Start2: | June 1775 |
| Term End2: | November 1775 |
| Predecessor2: | James William Montgomery |
| Successor2: | Sir Robert Murray Keith |
Adam Hay (after 1684 – 15 November 1775) was a Scottish officer in the British Army and a politician who sat in the House of Commons between 1767 and 1775.
He was the second surviving of John Hay of Haystoun, sheriff-depute of Peebles. His first marriage was to a Miss Britland of Nottingham. His second wife was Caroline Lucy Harpur, the daughter of Sir Henry Harpur, 5th Baronet and brother of Sir Henry Harpur, 6th Baronet.
He was the Member of Parliament (MP) for Peeblesshire from 1767 to 1768, and from June 1775 until his death in November that year. He was buried on 25 November 1775 at Calke, Derbyshire, the home of his second wife Caroline Lucy Harpur