Donnchadh mac Eoghan Ó Duinnshléibhe

Donnchadh mac Eoghan Ó Duinnshléibhe, anglicised as Donough MacOwen O'Donlevy (died 30 September 1527) was an Irish physician. He was the ollam leighis (official physician) of the O'Donnell dynasty from at least 1497 to 1527.

Background Born in the fifteenth century to a father named Owen, Ó Duinnshléibhe became known for his wealth. By the mid-fifteenth century, they were a hereditary medical family of physicians to the O'Donnells, based in Tyrconnell. Some members of the family went by the surname Ultach, named after Ulaid. Ó Duinnshléibhe had a son, Owen Ultach, who succeeded him as the O'Donnell's ollam leighis.