1584 in Ireland

Incumbent

• Monarch: Elizabeth I

Events

• July – English government commissions a survey of Munster, following the Desmond Rebellions. Sir Valentine Browne is appointed to the task. It becomes known as the Peyton Survey after Sir Christopher Peyton
• The Spanish Arch is built in Galway.
• Perrott subdivides Cavan into seven baronies.
• Richard Stanihurst's history De rebus in Hibernia gestis is published by Christophe Plantin in Antwerp.

Deaths

• 20 June – Dermot O'Hurley, Roman Catholic Archbishop of Cashel, put to death for treason.
• Margaret Ball, died of deprivation in the dungeons of Dublin Castle, beatified in 1992
• Sir Henry Colley, or Cowley, an Irish soldier and landowner.