Robert Henry Southwell styled The Honourable from 1766, was an Irish politician.

He was the second son of Thomas Southwell, 1st Viscount Southwell

Thomas Southwell, 1st Viscount Southwell

Thomas George Southwell, 1st Viscount Southwell , styled The Honourable from birth until 1766, was an Irish politician and freemason.-Background:...

 and his wife Margaret Hamilton, daughter of Arthur Cecil Hamilton. Southwell served as lieutenant-colonel of the 8th Dragoons. In 1776, he entered the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Downpatrick

Downpatrick (Parliament of Ireland constituency)

Downpatrick was a constituency represented in the Irish House of Commons until 1800.-History:In the Patriot Parliament of 1689 summoned by King James II, Downpatrick was not represented.-1689–1801:...

, representing the constituency until 1783.

In 1786, he married Frideswide Moore, daughter of John Moore, and had by her a son and a daughter. Southwell died at Clontarf, Dublin

Clontarf, Dublin

Clontarf is a coastal suburb on the northside of Dublin, in Ireland. It is most famous for giving the name to the Battle of Clontarf in 1014, in which Brian Boru, High King of Ireland, defeated the Vikings of Dublin and their allies, the Irish of Leinster. This battle, which extended to districts...

.