1100 in Ireland

Events from the year 1100 in Ireland.

Incumbents

 * Gilla na Naomh Ua hEidhin, King of Uí Fiachrach Aidhne, 1048–1100
 * Aodh Ua hEidhin, King of Uí Fiachrach Aidhne, 1100–1121

Deaths

 * Gilla na Naomh Ua hEidhin, King of Uí Fiachrach Aidhne