Thomas Pelham, 2nd Earl of Chichester (1756-1826), known before 1805 as Lord Pelham, son of the 1st earl, was surveyor-general of ordnance in Lord Rockingham's 2nd ministry (1782), and Chief Secretary for Ireland in the coalition ministry of 1783. In 1795 he became Irish chief secretary under Pitt's government, retiring in 1798; he was Home Secretary from July 1801 to August 1803 under Addington, who made him Chancellor of the Duchy of Lancaster in 1803. Pelham went out of office in 1804, and in the next year succeeded to the earldom. He was joint-Postmaster-General from 1807 to 1823, and for the remaining three years of his life Postmaster-General.

|- style="text-align: center;" | width="30%" |Preceded by:
Viscount Milton | width="40%" style="text-align: center;" |Chief Secretary for Ireland
1795–1798 | width="30%" |Succeeded by:
Viscount Castlereagh

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Portland | width="40%" style="text-align: center;" |Home Secretary
1801–1803 | width="30%" |Succeeded by:
Charles Philip Yorke

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Liverpool | width="40%" style="text-align: center;" |Chancellor of the Duchy of Lancaster
1803–1804 | width="30%" |Succeeded by:
The Lord Mulgrave

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Aylesford | width="40%" style="text-align: center;" |Captain of the Yeomen of the Guard
1804 | width="30%" |Succeeded by:
The Earl of Macclesfield

|- style="text-align: center;" | width="30%" |Preceded by:
— | width="40%" style="text-align: center;" |Postmaster-General
1823–1826 | width="30%" |Succeeded by:
The Lord Frederick Montagu