Charles MacCarty, Viscount Muskerry (1633 or 1634 – 1665), called Cormac in Irish, commanded a royalist battalion at the Battle of the Dunes during the interregnum. He was heir apparent to Donough MacCarty, 1st Earl of Clancarty but was killed at the age of 31 in the Battle of Lowestoft, a sea-fight against the Dutch, during the Second Anglo-Dutch War, and thus never succeeded to the earldom.