- See also David McAlister’s Irish Chess History web site (final scores in all championships from 1913 onwards) and David McAlister, History of the Early Championships, The Irish Chess Archive, 1999 (via the Wayback Machine) (pre-1913 championships).
- See also list of Irish champions, in descending order of number of championships won.
- See also list of Irish championship players, with years when they played.
- 1865-1911
- 1865 J. A. “Porterfield” Rynd (first Irish championship)
- 1886 Richard Whieldon Barnett
- 1889 George D. Soffe
- 1892 J. A. “Porterfield” Rynd
- Otherwise no championship
- 1912-1919
- (1912 Irish Chess Union formed)
- 1913 John J. O’Hanlon
- 1915 John J. O’Hanlon
- Otherwise no championship
- 1920-1929
- 1922 T. G. (Thomas George) Cranston
- 1924 Philip Baker
- 1925 John J. O’Hanlon (William Edward Thrift 1st-2nd; title awarded to O’Hanlon when Thrift could not play playoff match)
- 1926 John J. O’Hanlon (1st-3rd W. J. Allen, P. J. McMahon; O’Hanlon won double-round all-play-all playoff)
- 1927 Philip Baker
- 1928 Philip Baker
- 1929 Philip Baker
- Otherwise no championship
- 1930-1939
- 1930 John J. O’Hanlon
- 1931 T. G (Thomas George) Cranston
- 1932 John J. O’Hanlon
- 1933 James C. Creevey
- 1934 James C. Creevey
- 1935 John J. O’Hanlon
- 1936 John J. O’Hanlon
- 1937 Thomas Cox (1st-2nd Oscar A. Quigley; lost playoff match)
- 1938 Thomas Cox
- 1939 Barney O’Sullivan
- 1940-1949
- 1940 John J. O’Hanlon
- 1941-1945 No championship
- 1946 Barney O’Sullivan
- 1947 P. A. (Paddy) Duignan
- 1948 Dónal J. O’Sullivan
- 1949 Paddy Kennedy; Galway, July 17-23; 16 players, 7 rounds, 54 games (8 available)
- 1950-1959
- 1950 T. Vincent Maher
- 1951 Austin Bourke; Cork, July 16-24; 18 players, 8 rounds, 72 games (1 available)
- 1952 Michael Schuster
- 1953 E. N. (Noel) Mulcahy (1st-2nd T. Vincent Maher; lost on tie-break)
- 1954 Terry Kelly
- 1955 T. Vincent Maher (1st-2nd E. N. Mulcahy; lost on tie-break)
- 1956 Dónal J. O’Sullivan
- 1957 Dónal J. O’Sullivan (1st-2nd William R. Dunphy; lost on tie-break)
- 1958 Wolfgang Heidenfeld
- 1959 Brian Reilly
- 1960-1969
- 1960 Brian Reilly
- 1961 John Reid
- 1962 Michael Littleton and John Reid (1st-4th Alex Montwill, Brian Reilly; lost on tie-break); Derry, July 14-21; 16 players, 8 rounds, 64 games (1 available)
- 1963 Wolfgang Heidenfeld
- 1964 Wolfgang Heidenfeld; Dublin, July 11-17; 8 player all-play-all, 28 games (2 available)
- 1965 Michael Littleton
- 1966 John Moles
- 1967 Wolfgang Heidenfeld (1st-2nd Paul Henry; lost on tie-break)
- 1968 Wolfgang Heidenfeld
- 1969 Nick Patterson
- 1970-1979
- 1970 Paul Henry
- 1971 John Moles; Cork, July 10-18; 23 players, 9 rounds, 98 games (40 available)
- 1972 Wolfgang Heidenfeld (after playoff match); Dublin, July 8-16; 20 players, 9 rounds, 90 games (all available) (Matt O’Leary 1st-2nd; lost playoff match)
- 1973 Hugh MacGrillen; Cork, July 7-15; 18 players, 9 rounds, 81 games (19 available)
- 1974 Tony Doyle; Dublin, July 6-13; 28 players, 8 rounds, 112 games (1 available)
- 1975 Eamon Keogh and Alan Ludgate; Dublin, July 12-19; 30 players, 8 rounds, 119 games (11 available)
- 1976 Bernard Kernan; Coleraine, Co. Derry, July 17-25; 28 players, 9 rounds, 125 games (121 available)
- 1977 Ray Devenney and Alan Ludgate; Cork, July 9-17; 34 players, 9 rounds, 153 games (64 available)
- 1978 Alan Ludgate; Galway, July 8-16; 23 players, 9 rounds, 98 games (25 available)
- 1979 David Dunne and Eamon Keogh
- 1980-1989
- 1980 Paul Delaney; Cork, July 12-20; 24 players, 9 rounds, 106 games (17 available)
- 1981 David Dunne and Philip Short
- 1982 John Delaney (1st-3rd David Dunne, Philip Short; lost on tie-break); Cork, July 10-18; 23 players, 9 rounds, 99 games (16 available)
- 1983 David Dunne; Castlebar, Co. Mayo, July 9-17; 32 players, 9 rounds, up to 144 games (31 avaiable)
- 1984 Eugene Curtin
- 1985 Eugene Curtin and Mark Orr; Dublin, July 6-14; 30 players, 9 rounds, 126 games (34 available)
- 1986 John Delaney and Philip Short
- 1987 John Delaney
- 1988 Philip Short; Dublin, July 9-17; 21 players, 9 rounds, 89 games (15 available)
- 1989 Niall Carton
- 1990-1999
- 1990 John Delaney
- 1991 Stephen Brady; Limerick, July 13-21; 12 players, 9 rounds, 54 games (52 available)
- 1992 Stephen Brady
- 1993 Niall Carton
- 1994 Mark Orr; Armagh, July 9-17; 20 players, 9 rounds, 89 games (all available)
- 1995 Brian Kelly; Dublin, July 8-16; 26 players, 9 rounds, 114 games (112 available)
- 1996 Richard O’Donovan; Dublin, July 6-14; 25 players, 9 rounds, 107 games (105 available) (1st-3rd Tom Clarke, Colm Daly; lost on tie-break)
- 1997 Joe Ryan; Dublin, July 12-20; 18 players, 9 rounds, 81 games (all available)
- 1998 Colm Daly; Dublin, July 11-19; 20 players, 9 rounds, 88 games (all available)
- 1999 Colm Daly; Drogheda, April 3-11; 18 players, 9 rounds, 80 games (all available)
- 2000-2009
- 2000 Mark Heidenfeld; Castleconnell, Co. Limerick, April 22-30; 12 players, 9 rounds, 53 games (all available)
- 2001 Stephen Brady; Greystones, Co. Wicklow, July 7-15; 20 players, 9 rounds, 89 games (57 available)
- 2002 Sam Collins; Greystones, Co. Wicklow, July 6-14; 19 players, 9 rounds, 78 games (71 available)
- 2003 Stephen Brady; Greystones, Co. Wicklow, July 5-13; 18 players, 9 rounds, 78 games (35 available)
- 2004 Joe Ryan; Limerick, July 10-18; 20 players, 9 rounds, 90 games (all available) (Gawain Jones 1st-2nd; ineligible for title of Irish champion)
- 2005 Colm Daly; Dublin, July 9-17; 20 players, 9 rounds, 89 games (all available)
- 2006 Stephen Brady; Dublin, July 8-16; 12 players, 9 rounds, 52 games (14 available)
- 2007 Stephen Brady and Brian Kelly; Dublin, June 30–July 8; 52 players, 9 rounds, 229 games (224 available) (Mark Hebden and Nick Pert 1st-2nd; each ineligible for title of Irish champion)
- 2008 Alexander Baburin; Dublin, July 5-13; 32 players, 9 rounds, 134 games (133 available) (Alon Greenfeld 1st-2nd; ineligible for title of Irish champion)
- 2009 Colm Daly; Dublin, July 4-12; 29 players, 9 rounds, 123 games (of which 91 available)
- 2010-2019
- 2010 Alex Lopez; Dublin, July 3-11; 28 players, 9 rounds, 122 games (101 available)
- 2011 Stephen Brady; Dublin, July 2-10; 26 players, 9 rounds, 115 games (all available)
- 2012 Stephen Brady and Colm Daly; Dublin, July 7-15; 14 players, 9 rounds, 63 games (62 available) (Juri Firstov 1st-3rd, ineligible for title of Irish champion)
- 2013 Colm Daly; Limerick, July 6-14; 21 players, 9 rounds, 90 games (77 available)
- 2014 Sam Collins; Dublin, July 5-13; 30 players, 9 rounds, 129 games (all available)
- 2015 Stephen Brady and Philip Short; Dublin, July 4-12; 19 players, 9 rounds, 79 games (all available (1 incomplete))
- 2016 Stephen Jessel; Dublin, July 2-10; 16 players, 9 rounds, 72 games (all available)
- 2017 Philip Short and Alex Lopez; Ennis, Co. Clare, July 29-August 6; 16 players, 9 rounds, 71 games (all available)
- 2018 Alex Lopez; Dublin, August 4-12; 36 players, 9 rounds, 160 games (159 available)
- 2019 Conor E. Murphy; Dublin, August 3-11; 39 players, 9 rounds, 169 games (all available)
- 2020–
- 2020 Tom O’Gorman; Dublin, August 1-9; 32 players, 9 rounds, 140 games (all available)
- 2021 Mark Heidenfeld; Dublin, July 31-August 8; 36 players, 9 rounds, 156 games (all available)
- 2022 Tarun Kanyamarala; Dublin, July 2-10; 25 players, 9 rounds, 102 games (all available)
- 2023 Alexander Baburin; Dublin, August 5-13; 32 players, 9 rounds, 134 games + 2 rapid playoff games (131 + 2 available) (1st-2nd Kavin Venkatesan, lost rapid playoff)
Last updated August 26, 2023.