Fínghin mac Donncha Mac Carthaig, 1560–1640 (anglicised Florence MacCarthy), was an Irish prince of the late 16th century and the last credible claimant to the Mac Carthaig Mór title before its suppression by English authority. Mac Carthaig's involvement in the Nine Years' War (1595–1603) led to his arrest by the Crown, and he spent the last 40 years of his life in custody in London. His lands were distributed among his relatives and English colonists.