1790 in Ireland

• Monarch: George III

• 15 March – The Sick and Indigent Roomkeepers' Society is established in Dublin; by the 21st century this will be the city's oldest surviving charity.{{cite book|last=Lindsay|first=Deirdre|year=1990|title=Dublin's Oldest Charity|location=Dublin|publisher=Anniversary Press|ISBN=1-870940-06-7}}
• May – construction begins on the Royal Canal at Cross Guns Bridge in Phibsborough, Dublin.{{sfn|Clarke|1993|page=47}}
• Armagh Observatory, founded by Richard Robinson, 1st Baron Rokeby, Archbishop of Armagh, begins to function.

• Emo Court, near Emo, County Laois, is designed by James Gandon for John Dawson, 1st Earl of Portarlington.

• 1 January – George Petrie, painter, musician, antiquary and archaeologist (died 1866).
• 15 April – Theobald Jones, British Royal Navy officer, lichenologist and Unionist politician (died 1868).
• June – Arthur Jacob, ophthalmologist (died 1874).
• 10 October – Father Theobald Mathew, temperance reformer (died 1856).
• Alexander Pearce, transported convict and cannibal (executed 1824 in Van Diemen's Land).

• Patrick Browne, physician and botanist (born 1720).

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• {{cite journal |last = Clarke| first = Peter|title =The Royal Canal 1789-1993 | journal = Dublin Historical Record| volume = 46| issue = 1| pages = 46-52| publisher = Old Dublin Society| location = Dublin| date = 1993-02-17| jstor = 30101021| url=https://www.jstor.org/stable/30101021}}

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{{Years in Ireland}}

{{Year in Europe|1790}}

{{DEFAULTSORT:1790 In Ireland}}

Category:Years of the 18th century in Ireland

Ireland