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