Thomas Robinson, 2nd Baron Grantham

Thomas Robinson, 2nd Baron Grantham, PC (30 November 1738 – 20 July 1786), was a British politician who served as Foreign Secretary from 1782 to 1783.

Born in Vienna, Austria, Robinson was the son of Thomas Robinson, 1st Baron Grantham, and his wife Frances Worsley. His father was serving as the British Ambassador to Austria at the time of his birth. Robinson received his education at Westminster School and Christ's College, Cambridge.

In 1761, Robinson entered the House of Commons as the Member of Parliament for Christchurch. He succeeded his father to the peerage in 1770, becoming the 2nd Baron Grantham, which also resulted in his move to the House of Lords. That same year, he was appointed to the Privy Council.

Robinson was appointed as the British Ambassador to Spain in 1771, a position he held until the onset of war between Britain and Spain in 1779. During his diplomatic tenure in Spain, he was based at the Spanish Court in Aranjuez in 1772, where he received correspondence from Richard Wall, the Spanish Minister of Foreign Affairs.

From 1780 to 1782, he served as President of the Board of Trade. Subsequently, he was appointed Foreign Secretary, a role he held from July 1782 until April 1783 under Prime Minister Lord Shelburne.

In 1780, Robinson married Lady Mary Jemima Yorke (1757–1830), the younger daughter of Philip Yorke, 2nd Earl of Hardwicke. Lady Mary Jemima was also the second Marchioness Grey, a title she inherited in 1740 through her mother, Lady Jemima Campbell, due to a special remainder upon the death of her maternal grandfather, Henry Grey, 1st Duke of Kent. The Marchioness Grey title became extinct upon her death in 1797, but her daughter Lady Amabel Yorke was created Countess de Grey in 1816.

Robinson and his wife resided at Grantham House in Whitehall Yard, Westminster. They had two sons: Thomas de Grey (the eldest, later 2nd Earl de Grey), who was born Thomas Philip Robinson and later adopted the surname Weddell in 1803, and then de Grey in 1833; and Frederick John Robinson, who became the 1st Viscount Goderich and served as Prime Minister of the United Kingdom in 1827 and 1828.

Thomas Robinson, 2nd Baron Grantham, died on 20 July 1786 at the age of 46 and was succeeded by his elder son, Thomas de Grey. His widow remained at Grantham House until her death in January 1830 at the age of 72.