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Centuries:	16th; 17th; 18th; 19th; 20th;
Decades:	1760s; 1770s; 1780s; 1790s; 1800s;
See also:	Other events of 1789 ; List of years in Ireland

Events from the year 1789 in Ireland.

Incumbent

29 March – 12 July: John Wesley makes his last visit to Ireland.^[1]
20 June – following the death of James Hewitt, 1st Viscount Lifford, on 28 April, John FitzGibbon is appointed as Lord Chancellor of Ireland.^[1]
26 June – a Whig Club is established in Dublin.
28 August – the Hodson Baronetcy, of Holybrooke House in the County of Wicklow, is created in the Baronetage of Ireland for Robert Hodson, High Sheriff of Wicklow.^[2]
24 October – Royal Canal Company incorporated to construct a waterway from Dublin to the River Shannon.^[3]
Mail coaches begin a scheduled service from Dublin to Belfast.

26 March – Edward Ffrench Bromhead, mathematician (died 1855).
24 September – Richard Henry Wilde, lawyer and Congressman in USA (died 1847).
3 October – Henry Pottinger, soldier and colonial administrator, first Governor of Hong Kong (died 1856).
6 October – Sir Michael O'Loghlen, 1st Baronet, judge, politician and Attorney-General for Ireland (died 1842).
Mary Fildes, née Pritchard, political activist (died 1876 in England).

Full date unknown
- Frances Greville, poet (b. c1724).
- Barry St. Leger, British colonel during the American Revolutionary War (b. c1733).

^ ^a ^b Moody, T. W.; et al., eds. (1989). A New History of Ireland. 8: A Chronology of Irish History. Oxford University Press. ISBN 978-0-19-821744-2.
^ Kidd, Charles; Williamson, David, eds. (1990). Debrett's Peerage and Baronetage. New York: St. Martin's Press.
^ Delany, Ruth; Bath, Ian (2009). Ireland's Royal Canal 1789-2009. Dublin: Lilliput Press. ISBN 9781843511625.