Conn Oge O'Donnell (died 1601) was a member of the O'Donnell dynasty of Donegal. He was the youngest son of Conn O'Donnell, and grandson of Calvagh O'Donnell who had ruled the O'Donnell lands of Tyrconnell. During the 1580s he supported the unsuccessful claims of his elder brother Niall Garve O'Donnell to the chieftanship of the O'Donnells.
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