The Chatham ministry was a British government led by William Pitt, 1st Earl of Chatham that ruled between 1766 and 1768. Because of Pitt's former prominence before his title, it is sometimes referred to as the Pitt ministry. Unusually for a politician considered to be Prime Minister, Pitt was not First Lord of the Treasury during the administration, but instead held the post of Lord Privy Seal.
Pitt, who moved to the Lords as Earl of Chatham upon his accession to the ministry, was determined to form a ministry of "men, not measures," that would give office to the most competent men without regard to faction. Thus, the ministry kept on Secretary of State Henry Seymour Conway from the previous, Rockingham Whig, ministry, and, after Chatham's brother-in-law Lord Temple refused the Treasury and decided to continue in opposition with his brother, former prime minister George Grenville, he promoted Conway's fellow Rockingham Whig the Duke of Grafton to that position. Chatham's own close associates Lord Camden and Lord Shelburne became Lord Chancellor and Southern Secretary of State, respectively, and the ministry was filled out with other politicians of unclear factional allegiance – keeping on Lord Egmont at the Admiralty and Lord Granby at the Ordnance Board, moving the former Lord Chancellor, Lord Northington to the sinecure position of Lord President of the Council, and appointing the slippery Charles Townshend to the Exchequer.