1645 in Ireland

Events from the year 1645 in Ireland.

Incumbent

 * Monarch: Charles I

Events

 * Irish Confederate Wars: Lismore town and castle are sacked by a force of the Irish Confederacy commanded by Lord Castlehaven.
 * January 20–March 18 – Siege of Duncannon: Confederate general Thomas Preston takes Duncannon.
 * April 23 (Saint George's Day) – English Civil War: one hundred and fifty Irish soldiers bound for service with King Charles I of England are captured at sea by Parliamentarians and killed at Pembroke in Wales.
 * October 27 – Catholic Bishop Malachy Ó Caollaidhe is killed by Scottish forces during a Confederate expedition to Sligo.
 * The Society of Jesus establishes a school in Galway, the predecessor of Coláiste Iognáid.

Arts and literature

 * Henry Burkhead's closet drama Cola's Fury, or Lirenda's Misery, based on the Irish Rebellion of 1641, is written.
 * John Colgan's Acta Sanctorum Hiberniae is published in Leuven.

Deaths

 * Richard III de Bermingham, Anglo-Irish landowner (b. 1570)
 * Peter Martin (STP), Dominican.
 * Muiris mac Torna Ó Maolconaire, scribe and poet.