Robert Henry Southwell (October 1745[1] – 29 August 1817[2]), styled The Honourable from 1766, was an Irish politician.
He was the second son of Thomas Southwell, 1st Viscount Southwell and his wife Margaret Hamilton, daughter of Arthur Cecil Hamilton.[3] Southwell served as lieutenant-colonel of the 8th Dragoons.[4] In 1776, he entered the Irish House of Commons for Downpatrick, representing the constituency until 1783.[1]
In 1786, he married Frideswide Moore, daughter of John Moore, and had by her a son and a daughter.[3] Southwell died at Clontarf, Dublin.[2]
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