Lieutenant-General Thomas Wentworth, 1st Earl of Strafford (of the 2nd creation), KG (baptised 17 September 1672 – 15 November 1739), known as Thomas Wentworth, 3rd Baron Raby from 1695 to 1711, was a diplomat and First Lord of the Admiralty.
Thomas was a son of Sir William Wentworth of Northgatehead--who served as High Sheriff of Yorkshire--and his wife Isabella Apsley, daughter of Sir Allen Apsley. His paternal grandfather, Sir William Wentworth of Ashby Puerorum, was a younger brother of Thomas Wentworth, 1st Earl of Strafford.
In about 1687, he was a page of honour to Queen Mary of Modena. On 31 December 1688, he was commissioned a cornet in Colchester's Regiment of Horse. Thomas Wentworth saw much service as a soldier in the Low Countries, and was occasionally employed on diplomatic errands. He was appointed an aide-de-camp to King William in August 1692, was commissioned guideon and 1st major in the 1st Troop of Horse Guards 4 October 1693, and cornet and 1st major in the same 20 January 1694. On 7 May 1695, Wentworth was appointed a groom of the bedchamber to the king.
When his cousin William Wentworth, 2nd Earl of Strafford died without issue on 16 October 1695, Wentworth succeeded him as the 3rd Baron Raby. He did not inherit the Strafford fortune or the Jacobean house, Wentworth Woodhouse which passed to the second earl's nephew, Thomas Watson, son of his sister Anne.