Donnchadh mac Eoghan Ó Duinnshléibhe (died 30 September 1527) was an Irish physician and the "ollam leighis" or official physician of the O'Donnell dynasty. Ó Duinnshléibhe was a member of a hereditary medical family based in County Donegal who were formerly the ruling dynasty of the over-kingdom of Ulaid. The Annals of the Four Masters contain his obit, sub anno 1527: * The physician O'Donlevy (Donough, son of Owen), a Doctor of Medicine, and learned in other sciences, a man of great affluence and wealth, who kept a house of general hospitality, died on the 30th of September.