1111 in Ireland

• High King of Ireland: Domnall Ua Lochlainn

• Synod of Rathbreasail, presided over by Cellach Ua Sinaig, Abbot of Armagh is held. Ireland is divided into territorial dioceses (24 sees) under two metropolitans, the Archbishop of Armagh and the Archbishop of Cashel.{{cite book|title=The Oxford Illustrated History of Ireland|url=https://archive.org/details/oxfordillustrate00work|url-access=registration|last=Foster|first=R. F.|publisher=Oxford University Press|year=1989|isbn=978-0-19-822970-4 }}{{cite book|editor1=Moody, T. W. |editor2=Martin, F. X. |year=1967|title=The Course of Irish History|publisher=Mercier Press|location=Cork|pages=116–120}}
• Domnall Ua Briain becomes King of the Hebrides and the Isle of Man, following a request from the people of that kingdom to the King of Munster to send them a ruler.

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{{Year in Europe|1111}}

{{Years in Ireland}}