Ibar mac Lugna, whose name is also given as Iberius (/aɪˈbɪəriəs/ eye-BEER-ee-əs) or Ivor, was an early Irish saint, patron of Beggerin Island, and bishop.

According to the Annals of the Four Masters, Ibar was of noble birth and descended from the tribe of Ui Echach who occupied east County Down.

His sister Mella married Hua-Carbmiac, king of Hy-Kensellagh, a kingdom which consisted of all current county Wexford and a considerable part of Wicklow and Carlow.

When followers of Martin of Tours began to appear in Ireland, Ibar travelled to Armorica to learn more of this new teaching.

However, accounts of this may originate in the interest of Armagh to claim precedence over the other religious centres in Ireland, which could also demonstrate early bishops.