William Southwell (1669 – 23 January 1720)[1] was an Irish politician and British Army officer.
[3] During the Glorious Revolution of 1689, he and his brother were attainted by the parliament of King James II of England.
[4] Southwell entered the British Army under King William III of England in 1693.
[6] Southwell commanded four hundred grenadiers in the 1st Siege of Barcelona in 1705 and was made colonel of the 6th Regiment of Foot the following year.
[5] He sold his colonelcy to Thomas Harrison in 1708 and was appointed captain of the Battleaxe Guards in 1714, protecting the Lord Lieutenant of Ireland.