Justin Huntly McCarthy (1859–1936), Irish nationalist and UK Member of Parliament
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Justin McCarthy, Viscount Mountcashel (died 1694), Jacobite general in the Williamite War in Ireland
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Justin J. McCarthy (1900–1959), American prelate of the Roman Catholic Church
He married Lady Arabella Wentworth, daughter of Thomas Wentworth, 1st Earl of Strafford, who was many years older than himself; they had no children.
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Some of the key members of the Institute, Stanford Shaw, Heath W. Lowry, and Justin McCarthy, argue against defining the Armenian events as genocide.