← 1342 1341 1340 1339 1338 1343 in Ireland → 1344 1345 1346 1347 1348
Centuries:	12th 13th 14th 15th 16th
Decades:	1320s 1330s 1340s 1350s 1360s
See also:	Other events of 1343 List of years in Ireland

Events from the year 1343 in Ireland.

• Lord: Edward III

• 19 May – Robert Savage is appointed Seneschal of Ulster.
• 26 October – Ferghal mac Diarmata becomes Lord of Moylurg after his brother, Conchobhar Mac Diarmada, dies.
• Muircheartach Ó Briain, King of Thomond, dies. He is succeeded by his brother, Diarmaid, who is expelled by Brian Bán MacDomnaill Ó Briain.
• Toirdhealbhach Ó Conchobhair recovers kingship of Connacht from Aodh mac Aodh Breifneach. He makes peace with Mac Diarmada.
• King Niall Ó Domhnaill of Tir Conaill is deposed by his nephew Aonghus, with the aid and support of O Baoighill, Ó Dochartaigh, the MacSweenys and Aodh Reamhar Ó Neill.
• Clann Mhuircheartaigh is expelled from Bréifne by Ualgarg Mór Ó Ruairc, O Conchobhair, and Tadhg Mag Ragnaill. He is given refuge by King Aonghus of Tír Conaill in Tír Aodha (Tirhugh, County Donegal).
• Clanricarde and de Berminghams invade Uí Maine.
• Maurice Earl of Desmond occupies Imokilly (east County Cork).
• John L'Archers, Prior of the Order of St. John of Jerusalem appointed Lord Chancellor of Ireland

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• 26 October – Conchobhar Mac Diarmada, Lord of Moylurg;
• Muircheartach Ó Briain, King of Thomond

• "The Annals of Ireland by Friar John Clyn", edited and translated with an Introduction, by Bernadette Williams, Four Courts Press, 2007. ISBN 978-1-84682-034-2, pp. 240–244.
• "A New History of Ireland VIII: A Chronology of Irish History to 1976", edited by T. W. Moody, F.X. Martin and F.J. Byrne. Oxford, 1982. ISBN 0-19-821744-7.
• http://www.ucc.ie/celt/published/T100001B/index.html
• http://www.ucc.ie/celt/published/T100005C/index.html
• http://www.ucc.ie/celt/published/T100010B/index.html