1791 in Ireland

Events from the year 1791 in Ireland.

Incumbent

Monarch: George III
Events
September – Wolfe Tone publishes Argument on Behalf of the Catholics of Ireland.
14 October – the Northern Whig Club, a group of nine Belfast Presbyterians, meets with Wolfe Tone and Thomas Russell and forms the Society of United Irishmen to press for liberal non-denominational parliamentary reform.
7 November – The Custom House in Dublin opens for business, having been completed under the supervision of James Gandon.
The Grand Canal opens to a junction with the Barrow at Athy.
The first bridge across the River Foyle at Derry, built by the American Lemuel Cox in wood, is opened to vehicular traffic.
Births
6 March – John MacHale, Roman Catholic Archbishop of Tuam, Irish Nationalist and writer.
17 August – Richard Lalor Sheil, politician, writer and orator.
14 December – Charles Wolfe, poet.
;Full date unknown
:*James Graham, soldier, commended for his gallantry during the Battle of Waterloo.
Deaths
2 December – Henry Flood, statesman.
;Full date unknown
:*George Bryan, businessman, statesman and politician in Pennsylvania.
:*Robert Carver, artist.