Thomas Robinson until 1786 and as Lord Grantham from 1786 to 1833, of Wrest Park in the parish of Silsoe, Bedfordshire, was a British Tory statesman.

[1] He was the eldest son of Thomas Robinson, 2nd Baron Grantham (1738–1786) of Newby Hall, Newby-on-Swale, a deserted medieval village and of adjacent Rainton, both in the parish of Topcliffe in Yorkshire,[2] by his wife Mary Yorke (1757–1830), the younger daughter of Philip Yorke, 2nd Earl of Hardwicke by his wife Jemima Campbell, suo jure 2nd Marchioness Grey.

He also inherited her estate of Wrest Park in Silsoe, Bedfordshire.In 1798 he was admitted to St John's College, Cambridge, graduating MA in 1801.

[5] He was made Privy Counsellor in December 1834 while holding office as First Lord of the Admiralty till April 1835, and a Knight of the Garter in 1844.

[6] Charles Read has argued that De Grey was also the key figure who politically defeated the Irish nationalist Repeal movement without any bloodshed, a rare achievement in an era that featured the very bloody Peterloo massacre and the 1848 Revolutions in Europe.