Major-General Thomas Pelham-Clinton, 3rd Duke of Newcastle-under-Lyne (1 July 1752 – 18 May 1795), known as Lord Thomas Pelham-Clinton until 1779 and as Earl of Lincoln from 1779 to 1794, was a British Army officer and politician who sat in the House of Commons between 1774 and 1794 when he succeeded to the peerage as Duke of Newcastle. Pelham-Clinton also sat as Member of Parliament for Westminster from 1774 to 1780 and for East Retford from 1781 to 1794 and was Lord Lieutenant of Nottinghamshire from 1794 to 1795. In February 1794 he succeeded his father in the dukedom.