The Annals of the Kingdom of Ireland (Irish: Annála Ríoghachta Éireann) or the Annals of the Four Masters (Annála na gCeithre Máistrí) are chronicles of medieval Irish history. The entries span from the Deluge, dated as 2,242 years after creation to AD 1616. The annals are mainly a compilation of earlier annals, although there is some original work. They were compiled between 1632 and 1636 at a Franciscan friary near the Drowes river, now in County Leitrim, and on the border with County Donegal and County Sligo. The patron of the project was Fearghal Ó Gadhra, M.P., a Gaelic lord in Coolavin, County Sligo. The chief compiler of the annals was Brother Mícheál Ó Cléirigh from Ballyshannon, who was assisted by, among others, Cú Choigcríche Ó Cléirigh, Fearfeasa Ó Maol Chonaire and Peregrine Ó Duibhgeannain.

Although only one of the authors, Mícheál Ó Cléirigh, was a Franciscan friar, they became known as 'The Four Friars' or in the original Irish, Na Ceithre Máistrí. The Anglicized version of this was "The Four Masters", the name that became associated with the annals themselves. The annals are written in Irish. The several manuscript copies are held at Trinity College Dublin, the Royal Irish Academy, University College Dublin and the National Library of Ireland.