Justin McCarthy, Viscount Mountcashel

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The 1st Viscount Mountcashel
Tenure	1689–1694
Born	c. 1643
Died	1 July 1694 Barèges, France
Spouse(s)	Arabella Wentworth
Father	Donough, 1st Earl of Clancarty
Mother	Eleanor Butler

Justin McCarthy, 1st Viscount Mountcashel, PC (Ire) (c. 1643 – 1694), was a Jacobite general in the Williamite War in Ireland and a personal friend of James II. He commanded Irish Army troops during the conflict, enjoying initial success when he seized Bandon in County Cork in 1689. However, he was defeated and captured at the Battle of Newtownbutler later in the same year. He escaped and was accused of having broken parole. After the end of the war, he led an Irish Brigade overseas for service in the French Army. He died in French exile.