Thomas Southwell, 1st Viscount Southwell

Thomas George Southwell, 1st Viscount Southwell (4 May 1721 – 29 August 1780), styled The Honourable from birth until 1766, was an Irish politician and freemason.

He was the oldest son of Thomas Southwell, 2nd Baron Southwell and his wife Mary Coke, eldest daughter of Thomas Coke. Southwell was educated at Lincoln's Inn and went then to Christ Church, Oxford. He served in the 2nd Foot and became an ensign in 1738. Between 1753 and 1757, Southwell was Grandmaster of the Grand Lodge of Ireland.

In 1747, Southwell entered the Irish House of Commons for Enniscorthy, sitting for it until 1761. Subsequently he was returned for Limerick County, the same constituency his father and his uncle Henry Southwell had represented before, until 1766, when he succeeded his father as baron. Three years later, Southwell delivered his maiden speech in the Irish House of Lords. He was appointed Constable of Limerick Castle in 1750 and Governor of County Limerick in 1762, posts he held until his death in 1780. He was made High Sheriff of County Limerick for 1759. In 1776, Southwell was elevated to the title Viscount Southwell, of Castle Mattress, in the County of Limerick.

On 18 June 1741, he married Margaret Hamilton, daughter of Arthur Cecil Hamilton of Castle Hamilton, Killeshandra, Co. Cavan and had by her three sons and a daughter. Southwell died, aged 59 and was buried at Rathkeale. He was succeeded in his titles by his oldest son Thomas., while his younger son Robert sat also in the Parliament of Ireland.

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