Thomas de Grey (c. 1717–1781) of Merton Hall, Norfolk was an English landowner and Member of Parliament.
[1] Thomas junior was baptised on 29 September 1717 and attended school in Bury St Edmunds before going up to Christ's College, Cambridge in 1735.
He voted against repealing the Stamp Act in 1766 and against administration on the land tax in 1767, before being returned again for Norfolk in 1768 after a very costly campaign.
In 1772 he spoke in favour of the Royal Marriages Act but he became more and more affected by gout and so before the next general election in 1773 decided not to stand again.
Merton Hall passed to his nephew, Thomas de Grey, 2nd Baron Walsingham, son of his brother William.