1640 in Ireland

Incumbent

• Monarch: Charles I

Events

• 5 December – John Atherton, Church of Ireland Bishop of Waterford and Lismore, and his proctor are executed on a charge of buggery, on Saint Stephen's Green, Dublin.
• Approximate date – Dubhaltach Mac Fhirbhisigh transcribes the only surviving copy of the Chronicon Scotorum.

Arts and literature

• 17 March – Henry Burnell's play Landgartha premieres at the Werburgh Street Theatre in Dublin. It is one of the earliest dramatic works from a native Irish playwright.
• James Shirley's play Saint Patrick for Ireland is published. The author returns to England around 16 April.

Births

• 29 June – Elizabeth Stanhope, [Countess of Chesterfield (d. 1665)|Elizabeth Stanhope, Countess of Chesterfield]
• Thomas Beecher, politician and soldier
• Charles [Molloy (lawyer)|Charles Molloy], lawyer
• Approximate date
• *Thomas Knox, politician
• *Philip Og O'Reilly, politician

Deaths

• 5 December – John Atherton, Bishop of Waterford and Lismore