Thomas Pelham, 2nd Earl of Chichester PC, PC (Ire), FRS (28 April 1756 – 4 July 1826), styled The Honourable Thomas Pelham from 1768 until 1783, The Right Honourable Thomas Pelham from 1783 to 1801, and then known as Lord Pelham until 1805, was a British Whig politician. He notably held office as Home Secretary under Henry Addington from 1801 to 1803.