Editing Cathaoirleach (section)

===Leas-Chathaoirleach===
The Cathaoirleach's deputy is the {{lang|ga|Leas-Chathaoirleach}}.

{| class="wikitable" style="text-align:center"
|-
!Seanad
!Name<br/>{{small|(Birth–Death)}}
!Portrait
!colspan=2|Term of office
!colspan=2|Party
!Panel
|-
|[[1922 Seanad|1922]]
|[[James G. Douglas]]<br>{{small|(1887–1954)}}
|[[File:James Green Douglas, circa 1940s.jpg|70px]]
|12 December 1922
|9 December 1925
|{{party name with colour|Independent politician}}
|''N/A''
|-
|[[1925 Seanad|1925]]
|[[Thomas Westropp Bennett]]<br>{{small|(1867–1962)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|9 December 1925
|12 December 1928
|{{party name with colour|Cumann na nGaedheal}}
|''N/A''
|-
|rowspan=2|[[1928 Seanad|1928]]
|[[Patrick W. Kenny]]<br>{{small|(died 1931)}}
|[[File:Patrick W. Kenny, circa 1927.jpg|70px]]
|12 December 1928
|22 April 1931
|{{party name with colour|Cumann na nGaedheal}}
|''N/A''
|-
|[[Patrick Hooper]]<br>{{small|(died 1931)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|6 May 1931
|6 September 1931
|{{party name with colour|Independent politician}}
|''N/A''
|-
|[[1931 Seanad|1931]]
|[[Michael F. O'Hanlon]]<br>{{small|(1890–1967)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|20 January 1932
|12 December 1934
|{{party name with colour|Cumann na nGaedheal}}
|''N/A''
|-
|rowspan=2|[[1934 Seanad|1934]]
|[[Michael Comyn]]<br>{{small|(1871–1952)}}
|[[File:Michael Comyn 1933.png|70px]]
|12 December 1934
|24 February 1936
|{{party name with colour|Fianna Fáil}}
|''N/A''
|-
|[[David Robinson (Irish politician)|David Robinson]]<br>{{small|(1882–1943)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|11 March 1936
|19 May 1936<ref name="senate"/>
|{{party name with colour|Fianna Fáil}}
|''N/A''
|-
|[[2nd Seanad|2nd]]
|[[Pádraic Ó Máille]]<br>{{small|(1878–1946)}}
|[[File:Pádraic Ó Máille, circa 1922.jpg|70px]]
|11 May 1938
|30 November 1938
|{{party name with colour|Fianna Fáil}}
|[[Agricultural Panel]]
|-
|[[3rd Seanad|3rd]]
|rowspan=2|[[Michael Tierney (politician)|Michael Tierney]]<br>{{small|(1894–1975)}}
|rowspan=2|
|30 November 1938
|27 October 1943
|{{party name with colour|rowspan=2|Fine Gael}}
|rowspan=2|[[National University of Ireland (constituency)#Seanad|National University of Ireland]]
|-
|[[4th Seanad|4th]]
|27 October 1943
|18 August 1944
|-
|[[5th Seanad|5th]]
|[[Timothy O'Donovan]]<br>{{small|(1881–1957)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|18 August 1944
|21 April 1948
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
|[[6th Seanad|6th]]
|[[Seán Goulding]]<br>{{small|(1877–1959)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|21 April 1948
|14 August 1951
|{{party name with colour|Fianna Fáil}}
|[[Administrative Panel]]
|-
|[[7th Seanad|7th]]
|[[Timothy O'Donovan]]<br>{{small|(1881–1957)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|7 November 1951
|27 July 1954
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
|[[8th Seanad|8th]]
|[[Liam Ó Buachalla]]<br>{{small|(1899–1970)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|27 July 1954
|29 May 1957
|{{party name with colour|Fianna Fáil}}
|[[Cultural and Educational Panel]]
|-
|rowspan=2|[[9th Seanad|9th]]
|[[Patrick Baxter (politician)|Patrick Baxter]]<br>{{small|(1891–1959)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|29 May 1957
|3 April 1959
|{{party name with colour|Clann na Talmhan}}
|[[Agricultural Panel]]
|-
|[[John O'Donovan (politician)|John O'Donovan]]<br>{{small|(1908–1982)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|30 May 1959
|3 January 1962
|{{party name with colour|Fine Gael}}
|[[Cultural and Educational Panel]]
|-
|[[10th Seanad|10th]]
|[[Patrick Lindsay (Irish politician)|Patrick Lindsay]]<br>{{small|(1914–1993)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|3 January 1962
|30 June 1965
|{{party name with colour|Fine Gael}}
|[[Industrial and Commercial Panel]]
|-
|[[11th Seanad|11th]]
|rowspan=2|[[James Dooge]]<br>{{small|(1922–2010)}}
|rowspan=2|[[File:James Dooge, 1981 (cropped).tif|70px]]
|30 June 1965
|12 November 1969
|{{party name with colour|rowspan=2|Fine Gael}}
|[[Labour Panel]]
|-
|[[12th Seanad|12th]]
|12 November 1969
|20 June 1973
|[[Industrial and Commercial Panel]]
|-
|[[13th Seanad|13th]]
|[[Evelyn Owens]]<br>{{small|(1931–2010)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|20 June 1973
|2 November 1977
|{{party name with colour|Labour Party (Ireland)}}
|[[Labour Panel]]
|-
|rowspan=2|[[14th Seanad|14th]]
|[[Joe McCartin]]<br>{{small|(born 1939)}}
|[[File:Joe McCartin, 2004 (cropped).jpg|70px]]
|2 November 1977
|12 July 1979
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
||[[Charles McDonald (Irish politician)|Charles McDonald]]<br>{{small|(born 1935)}}
|[[File:Charles McDonald, June 12 1973 (cropped).jpg|70px]]
|18 July 1979
|13 May 1982
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
|[[15th Seanad|15th]]
|[[Séamus Dolan]]<br>{{small|(1914–2010)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|9 October 1981
|19 May 1982
|{{party name with colour|Fianna Fáil}}
|[[Labour Panel]]
|-
|[[16th Seanad|16th]]
|[[Charles McDonald (Irish politician)|Charles McDonald]]<br>{{small|(born 1935)}}
|[[File:Charles McDonald, June 12 1973 (cropped).jpg|70px]]
|19 May 1982
|9 March 1983
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
|[[17th Seanad|17th]]
|[[Tras Honan]]<br>{{small|(1930–2023)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|9 March 1983
|25 April 1987
|{{party name with colour|Fianna Fáil}}
|[[Administrative Panel]]
|-
|[[18th Seanad|18th]]
|[[Charles McDonald (Irish politician)|Charles McDonald]]
{{Small|(born 1935)}}
|[[File:Charles McDonald, June 12 1973 (cropped).jpg|70px]]
|20 May 1987
|8 November 1989
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|-
|[[19th Seanad|19th]]
|rowspan=2|[[Liam Naughten]]<br>{{small|(1944–1996)}}
|rowspan=2|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|8 November 1989
|25 February 1993
|{{party name with colour|rowspan=2|Fine Gael}}
|rowspan=2|[[Agricultural Panel]]
|-
|rowspan=2|[[20th Seanad|20th]]
|25 February 1993
|12 July 1995
|-
|[[Brian Mullooly]]<br>{{small|(born 1935)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|19 July 1995
|18 September 1997
|{{party name with colour|Fianna Fáil}}
|[[Labour Panel]]
|-
|[[21st Seanad|21st]]
|[[Liam T. Cosgrave]]<br>{{small|(born 1956)}}
|[[File:No image.png|70px]]<!-- DO NOT ADD A NON-FREE IMAGE FOR THIS PERSON – ONLY FREELY LICENCED IMAGES ARE ALLOWED FOR LISTS. SEE WP:NFLISTS -->
|18 September 1997
|13 September 2002
|{{party name with colour|Fine Gael}}
|[[Industrial and Commercial Panel]]
|-
|[[22nd Seanad|22nd]]
|rowspan=2|[[Paddy Burke]]<br>{{small|(born 1955)}}
|rowspan=2|[[File:Paddy_Burke_2014.jpg|70px]]
|13 September 2002
|13 September 2007
|{{party name with colour|rowspan=2|Fine Gael}}
|rowspan=2|[[Agricultural Panel]]
|-
|[[23rd Seanad|23rd]]
|13 September 2007
|25 May 2011
|-
|[[24th Seanad|24th]]
|[[Denis O'Donovan]]<br>{{small|(born 1955)}}
|[[File:Denis O'Donovan at the Enthronement of Naruhito (1).jpg|70px]]
|25 May 2011
|8 June 2016
|{{party name with colour|Fianna Fáil}}
|[[Industrial and Commercial Panel]]
|-
|[[25th Seanad|25th]]
|[[Paul Coghlan]]<br>{{small|(1944–2023)}}
|[[File:Paul Coghlan, June 2018 (cropped).jpg|70px]]
|15 June 2016
|27 March 2020
|{{party name with colour|Fine Gael}}
|[[Industrial and Commercial Panel]]
|-
|rowspan=3|[[26th Seanad|26th]]
|[[Jerry Buttimer]]<br>{{small|(born 1967)}}
|[[File:Jerry Buttimer.jpg|70px]]
|7 July 2020
|21 August 2020
|{{party name with colour|Fine Gael}}
|[[Labour Panel]]
|-
|[[Joe O'Reilly]]<br>{{small|(born 1955)}}
|[[File:Joe O'Reilly, November 2022 (cropped).jpg|70px]]
|22 August 2020
|16 December 2022
|{{party name with colour|Fine Gael}}
|[[Labour Panel]]
|-
|[[Mark Daly (politician)|Mark Daly]]<br>{{small|(born 1973)}}
|[[File:Mark Daly 2022.jpg|70px]]
|16 December 2022
|12 February 2025
|{{party name with colour|Fianna Fáil}}
|[[Administrative Panel]]
|-
|[[27th Seanad|27th]]
|[[Maria Byrne]]
|[[File:Maria Byrne, January 2025 (cropped).jpg|70px]]
|19 February 2025
|''Incumbent''
|{{party name with colour|Fine Gael}}
|[[Agricultural Panel]]
|}