Justin McCarthy, Viscount Mountcashel

The 1st Viscount Mountcashel
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Tenure1689–1694
Bornc. 1643
Died1 July 1694
Barèges, France
Spouse(s)Arabella Wentworth
FatherDonough, 1st Earl of Clancarty
MotherEleanor 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.