No. |
Portrait |
Chief of Staff | Took office | Left office | Time in office | Defence branch |
1 | | O'Duffy, EoinGeneral Eoin O'Duffy (1890–1944) | February 1922 | July 1922 | 5 months | Army |
2 | | Mulcahy, RichardGeneral Richard Mulcahy (1886–1971) | July 1922 | August 1922 | 1 month | Army |
3 | | Mac Mahon, SeánGeneral Seán Mac Mahon (1893–1955) | August 1922 | March 1924 | 1 year, 7 months | Army |
4 | | MacMahon, PeadarGeneral Peadar MacMahon | March 1924 | March 1927 | 3 years | Army |
5 | | Hogan, DanielGeneral Daniel Hogan (1895–?) | March 1927 | February 1929 | 1 year, 11 months | Army |
6 | | Mac Eoin, SeánGeneral Seán Mac Eoin (1893–1973) | February 1929 | October 1929 | 8 months | Army |
7 | | Sweeney, JosephLieutenant General Joseph Sweeney (1897–1980) | October 1929 | October 1931 | 2 years | Army |
8 | | Brennan, MichaelLieutenant General Michael Brennan (1896–1986) | October 1931 | January 1940 | 8 years, 3 months | Army |
9 | | McKenna, DanielLieutenant General Daniel McKenna | January 1940 | January 1949 | 9 years | Army |
10 | | Archer, LiamLieutenant General Liam Archer | January 1949 | January 1952 | 3 years | Army |
11 | | Egan, W.Lieutenant General W. A. Egan | January 1952 | December 1954 | 2 years, 11 months | Army |
12 | | Mulcahy, PatrickLieutenant General Patrick Mulcahy | January 1955 | December 1959 | 4 years, 11 months | Army |
13 | | McKeown, JohnLieutenant General John McKeown (1910–1998) | January 1960 | December 1960 | 11 months | Army |
14 | | Powell, SeanLieutenant General Sean Collins Powell (1905–1991) | January 1961 | March 1962 | 1 year, 2 months | Army |
(13) | | McKeown, JohnLieutenant General John McKeown (1910–1998) | April 1962 | March 1971 | 8 years, 11 months | Army |
15 | | Delaney, PatrickMajor General Patrick Delaney | April 1971 | July 1971 | 3 months | Army |
15 | | O'Carroll, ThomasLieutenant General Thomas O'Carroll | April 1971 | July 1976 | 5 years, 3 months | Army |
16 | | O'Sullivan, CarlLieutenant General Carl O'Sullivan | August 1976 | June 1981 | 4 years, 11 months | Army |
17 | | Hogan, LouisLieutenant General Louis Hogan DSM (1921–2001) | June 1981 | April 1984 | 2 years, 10 months | Army |
18 | | O'Sullivan, GeraldLieutenant General Gerald O'Sullivan | April 1984 | February 1986 | 1 year, 10 months | Army |
19 | | O'Neill, TadghLieutenant General Tadgh O'Neill | February 1986 | October 1989 | 3 years, 8 months | Army |
20 | | Parker, JamesLieutenant General James Parker (1929–2020) | October 1989 | April 1992 | 2 years, 6 months | Army |
21 | | Bergin, NoelLieutenant General Noel Bergin | April 1992 | December 1994 | 2 years, 8 months | Army |
22 | | McMahon, GeraldLieutenant General Gerald McMahon | February 1995 | August 1998 | 3 years, 6 months | Army |
23 | | Stapleton, DavidLieutenant General David Stapleton DSM | August 1998 | 24 September 2000 | 2 years, 1 month | Army |
24 | | Mangan, ColmLieutenant General Colm Mangan | 25 September 2000 | 20 February 2004 | 3 years, 4 months | Army |
25 | | Sreenan, JamesLieutenant General James Sreenan | 21 February 2004 | 28 June 2007 | 3 years, 4 months | Army |
26 | | Earley, DermotLieutenant General Dermot Earley DSM (1948–2010) | 28 June 2007 | 9 June 2010 | 2 years, 11 months | Army |
27 | | McCann, SeanLieutenant General Sean McCann | 9 June 2010 | 12 August 2013 | 3 years, 2 months | Army |
28 | | O'Boyle, ConorLieutenant General Conor O'Boyle | 12 August 2013 | 29 September 2015 | 2 years, 1 month | Army |
29 | | Mellett, MarkVice Admiral Mark Mellett DSM (born 1958) | 29 September 2015 | 29 September 2021 | 6 years | Naval Service |
30 | | Clancy, SeánLieutenant General Seán Clancy | 29 September 2021 | Incumbent | 2 years, 6 months | Air Corps |