General John Pitt, 2nd Earl of Chatham, KG, PC (9 October 1756 – 24 September 1835) was a British peer and soldier.
He was the eldest son of William Pitt the Elder and an elder brother of William Pitt the Younger. He was commissioned into the 47th Regiment of Foot in 1774.
Later he served in various capacities, including First Lord of the Admiralty, Lord Privy Seal and Lord President of the Council, in the Tory cabinets of the late 18th and early 19th centuries. In 1809, during the Napoleonic Wars, he commanded the British force in the Walcheren Campaign. He was Governor of Jersey from 1807 to 1820 and Governor of Gibraltar from 1820 to 1835. The Chatham Counterguard in Gibraltar was named for the Earl of Chatham.
He married The Hon. Mary Townshend, daughter of the 1st Baron Sydney, on 10 July 1783. He died without issue and the Earldom of Chatham became extinct.
Titles from birth to death 
- Mr. John Pitt (1756–1761)
- The Hon. John Pitt (1761–1766)
- Viscount Pitt (1766–1778)
- The Rt. Hon. The Earl of Chatham (1778–1789)
- The Rt. Hon. The Earl of Chatham, PC (1789–1790)
- The Rt. Hon. The Earl of Chatham, KG, PC (1790–1835)