1791 in Ireland

Centuries:	16th; 17th; 18th; 19th; 20th;
Decades:	1770s; 1780s; 1790s; 1800s; 1810s;
See also:	Other events of 1791 ; List of years in Ireland

Events from the year 1791 in Ireland.

Incumbent

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.^[1]
The first bridge across the River Foyle at Derry, built by the American Lemuel Cox in wood, is opened to vehicular traffic.^[2]

6 March – John MacHale, Roman Catholic Archbishop of Tuam, Irish Nationalist and writer (died 1881).
17 August – Richard Lalor Sheil, politician, writer and orator (died 1851).
14 December – Charles Wolfe, poet (died 1823).
Full date unknown
- James Graham, soldier, commended for his gallantry during the Battle of Waterloo (died 1845).

2 December – Henry Flood, statesman (born 1732).
Full date unknown
- George Bryan, businessman, statesman and politician in Pennsylvania (born 1731).
- Robert Carver, artist (b. c1730).

^ Delany, Ruth (1988). A celebration of 250 years of Ireland's Inland Waterways. Belfast: Appletree Press. p. 82. ISBN 0-86281-200-3.
^ "The Boston Bridge - Londonderry's First Bridge Across The Foyle". Northern Scrivener. 2012-12-30. Retrieved 2013-02-27.