List of Seanad by-elections

This is a list of by-elections to Seanad Éireann, the senate of the Oireachtas, the legislature of Ireland, established in 1938. By-elections occur to fill vacant seats which can be caused by the death, resignation, disqualification or expulsion of a sitting senator. By-elections to the university constituencies are conducted on the same basis as general elections to these constituencies.^[1] By-elections to the vocational panels are held on a reduced electorate of members of the Oireachas only.^[2]

By-elections since 1938

By-elections in which seats changed parties are indicated with a grey background.

Seanad	Constituency	Vacancy				By-election
		Outgoing	Party		Cause	Date	Winner	Party
3rd	Cultural and Educational	Thomas Delany		Ind	Death on 9 July 1939	22 January 1941	Thomas J. O'Connell		Lab
5th	Labour	John Thomas Keane		Ind	Death on 22 May 1946	24 July 1946	Frederick Hawkins		Ind
5th	Dublin University	T. C. Kingsmill Moore		Ind	Incompatible office: appointed as a judge of the High Court on 11 June 1947	22 November 1947	Joseph Warwick Bigger		Ind
6th	Industrial and Commercial	Joseph Brennan		Ind	Death on 1 February 1950	12 March 1952	Mary Davidson		Lab
7th	Dublin University	Gardner Budd		Ind	Incompatible office: appointed as a judge of the High Court on 2 October 1951	12 March 1952	William J. E. Jessop		Ind
7th	NUI	Helena Concannon		FF	Death on 27 February 1952	14 May 1956	John F. Cunningham		Ind
8th	Administrative	James McGee		Ind	Death on 19 January 1956	14 May 1956	William Woods		Ind
8th	Agricultural	William Quirke		FF	Death on 5 March 1955	14 May 1956	Joe Sheridan		Ind
8th	Industrial and Commercial	Matthew Smith		FF	Death on 3 November 1955	14 May 1956	James O'Keeffe		FG
8th	Industrial and Commercial	Andrew Clarkin		FF	Death on 23 November 1955	14 May 1956	Seamus Bohan		Ind
9th	Administrative	John O'Leary		Lab	Death on 21 June 1959	9 February 1960	John J. Brennan		FF
9th	Agricultural	Patrick Baxter		CnaT	Death on 3 April 1959	9 February 1960	Martin O'Dwyer		Ind
9th	Dublin University	William Fearon		Ind	Death on 27 December 1959	13 May 1960	William J. E. Jessop		Ind
9th	Administrative	Patrick Teehan		FF	Incompatible office: elected to the Dáil on 23 June 1960	1 November 1960	Gerard B. Dillon		FF
9th	Labour	Frank Purcell		Ind	Death on 2 April 1960	1 November 1960	Edward Browne		Ind
10th	Agricultural	John Donnelly Sheridan		Ind	Death on 5 April 1963	28 November 1963	Batt Donegan		FF
10th	Industrial and Commercial	Daniel Moloney		FF	Death on 26 June 1963	28 November 1963	John Costelloe		FF
12th	Agricultural	James Martin		FF	Death on 3 October 1969	24 February 1970	Cornelius O'Callaghan		FF
12th	Administrative	Patrick Malone		FG	Incompatible office: elected to the Dáil on 14 April 1970	16 June 1970	Seán Keegan		FF
12th	Dublin University	Owen Sheehy-Skeffington		Ind	Death on 7 June 1970	19 November 1970	Trevor West		Ind
13th	Administrative	Seán Brosnan		FF	Incompatible office: elected to the Dáil on 13 November 1974	23 April 1975	Micheál Prendergast		FG
13th	Agricultural	Cornelius O'Callaghan		FF	Death on 24 January 1974	23 April 1975	Pat Codd		FG
13th	Agricultural	Bob Aylward		FF	Death on 18 July 1974	23 April 1975	Michael Ferris		Lab
13th	Cultural and Educational	Billy Fox		FG	Death on 12 March 1974	23 April 1975	Roddy Connolly		Lab
13th	Industrial and Commercial	Denis Farrelly		FG	Death on 27 December 1974	23 April 1975	Jack Daly		FG
13th	Cultural and Educational	Mary Walsh		FG	Death on 18 August 1976	25 October 1976	Vincent McHugh		FG
14th	Administrative	Jack Garrett		FF	Death on 11 September 1977	7 December 1977	Michael Donnelly		FF
14th	Dublin University	Conor Cruise O'Brien		Ind	Resigned on 13 June 1979	11 December 1979	Catherine McGuinness		Ind
14th	Administrative	Liam Burke		FF	Incompatible office: elected to the Dáil on 7 November 1979	16 April 1980	Jim Doolan		FF
18th	Industrial and Commercial	Jack Daly		FG	Death on 5 May 1988	19 December 1988	Tony Bromell		FF
20th	Industrial and Commercial	Seán Fallon		FF	Death on 4 July 1995	23 February 1996	Sam McAughtry		Ind
20th	Agricultural	Liam Naughten		FG	Death on 16 November 1996	28 January 1997	Denis Naughten		FG
21st	Labour	Seán Ryan		Lab	Incompatible office: elected to the Dáil on 11 March 1998	23 June 1998	John Cregan		FF
21st	Agricultural	Patrick McGowan		FF	Death on 3 October 1999	9 June 2000	Seán Ó Fearghaíl		FF
21st	Industrial and Commercial	Pat Gallagher		Lab	Resigned on 12 October 1999	9 June 2000	Jim Glennon		FF
21st	Agricultural	Tom Hayes		FG	Incompatible office: elected to the Dáil on 30 June 2001	9 December 2001	M. J. Nolan		FF
23rd	Agricultural	Alan Kelly		Lab	Incompatible office: elected to the European Parliament on 5 June 2009	14 December 2009	Niall Ó Brolcháin		GP
23rd	Agricultural	Peter Callanan		FF	Death on 11 October 2009	19 January 2010	Paschal Mooney		FF
23rd	Administrative	Tony Kett		FF	Death on 19 April 2009	26 November 2009	James Carroll		FF
24th	Cultural and Educational	Deirdre Clune		FG	Incompatible office: elected to the European Parliament on 23 May 2014	20 October 2014	Gerard Craughwell		Ind
24th	Industrial and Commercial	Jimmy Harte		Lab	Resigned on 23 September 2015	13 November 2015	Máiría Cahill		Lab
25th	Agricultural	Denis Landy		Lab	Resigned on 28 November 2017	27 April 2018	Ian Marshall[3]		Ind U
25th	Agricultural	Trevor Ó Clochartaigh		Ind	Resigned on 5 March 2018	27 April 2018	Anthony Lawlor[3]		FG
25th	Agricultural	Grace O'Sullivan		GP	Incompatible office: elected to the European Parliament on 24 May 2019	1 November 2019	Pippa Hackett		GP
26th	Agricultural	Michael W. D'Arcy		FG	Resigned on 28 June 2020	21 April 2021	Maria Byrne[4]		FG
26th	Industrial and Commercial	Elisha McCallion		SF	Resigned on 29 October 2020	21 April 2021	Gerry Horkan[4]		FF
26th	Dublin University	Ivana Bacik		Lab	Incompatible office: elected to the Dáil on 9 July 2021	30 March 2022	Tom Clonan		Ind
26th	Administrative Panel	Niall Ó Donnghaile		SF	Resigned on 22 January 2024	29 April 2024	Mal O'Hara		GP

See also

• List of Dáil by-elections
• List of Irish politicians who changed party affiliation