Matthew Plunkett, 7th Baron Louth (died September 1689) was an Irish Jacobite soldier and peer.
In 1679 he succeeded to his father's peerage and assumed his seat in the Irish House of Lords.
[1] Louth participated in the Williamite War in Ireland on the side of James II, and commanded the mortars at the Siege of Derry in 1689.
[3][4] He was declared an outlaw by the government of William III of England, but had died by September 1689.
Louth's great-great-grandson, the eleventh Baron, managed to obtain a reversal of the outlawry and was restored to the title.