William Cadogan, 1st Earl Cadogan

The Right Honourable The Earl of Cadogan KT, PC
William Cadogan (c.1671–1726) by Louis Laguerre
Born	1671 Liscarton, County Meath, Ireland
Died	17 July 1726 (aged 54–55) Kensington Gravel Pits, London
Buried	Westminster Abbey
Allegiance	Kingdom of Great Britain
Service/branch	British Army
Years of service	1689–1726
Rank	Lieutenant-General
Unit	1st Regiment of Foot Guards
Battles/wars	Williamite War in Ireland Battle of the Boyne Siege of Cork Siege of Limerick Nine Years War Siege of Namur War of the Spanish Succession Battle of Schellenberg Battle of Blenheim Battle of Malplaquet Bombardment of Arras 1715 Jacobite Rising

Lieutenant-General William Cadogan, 1st Earl Cadogan KT, PC (c. 1671-1726) was an Irish-born British Army officer. He began his active military service during the Williamite War in Ireland in 1689 and ended it with the suppression of the 1715 Jacobite Rebellion. A close associate and confidant of the Duke of Marlborough, he was also a diplomat and Whig politician who sat in the English and British Houses of Commons from 1705 until 1716, when he was raised to the peerage as Baron Cadogan.

A strong supporter of the Hanoverian Succession, he took part in the suppression of the 1715 Jacobite Rebellion and succeeded Marlborough in 1722 as Master-General of the Ordnance and senior army commander.