| - | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | Y | Z |
| Athlete | Sex | First Appearance | Last Appearance | Appearances | Colleges | Race Types |
|---|---|---|---|---|---|---|
| Adam Jack | m | 2013-06-01 | 2013-06-01 | 1 | Guest | 4x400m |
| Adam Jack | m | 2013-06-01 | 2013-06-01 | 1 | SU | 1500m |
| Ewan Jack | m | 1994-06-28 | 1994-06-28 | 2 | SU | 3000mSC, 800m |
| Henry "Harry" W. Jack | m | 1912-06-03 | 1913-05-24 | 2 | UCC | Mile |
| Adrian Jackman | m | 2006-04-21 | 2010-04-24 | 32 | WIT | 100m, 110mH, 200m, 4x100m, 4x200m, 4x400m, 60m, 60mH |
| Nicholas Jackman | m | 2002-04-19 | 2002-04-20 | 1 | Guest | DT |
| F.C. Jackson | m | 1929-06-01 | 1929-06-01 | 1 | TCD | DT |
| G.B. Jackson | m | 1933-05-27 | 1933-05-27 | 1 | TCD | DT |
| Greg Jackson | m | 2006-03-04 | 2006-03-04 | 1 | NUIG | XC |
| Karl Jackson | m | 2000-02-26 | 2000-02-26 | 1 | UCC | XC |
| Jeku Jacob | m | 2006-12-02 | 2008-04-19 | 4 | UCD | HJ, LJ, TJ |
| John O. Jagoe | m | 1924-05-31 | 1926-06-05 | 11 | UCC | 120yH, 440y, 880y, LJ, Mile |
| Joseph "Joe" Jagoe | m | 1956-05-16 | 1957-05-18 | 2 | UCC | 880y |
| R.B. Jagoe | m | 1922-06-10 | 1924-05-31 | 3 | UCC | 3 Miles, 880y, Mile |
| A. James | m | 1999-03-06 | 1999-03-06 | 1 | Guest | XC |
| Kieran James | m | 2009-11-14 | 2015-11-14 | 30 | UCC | 1500m, 4x100m, 4x400m, 5000m, 800m, Road, XC |
| M. James | m | 1924-05-31 | 1924-05-31 | 3 | UCD | 100y, 220y |
| Steve James | m | 1977-06-14 | 1977-06-14 | 1 | Birmingham | 400mH |
| N. Janssen | m | 1971-05-22 | 1971-05-22 | 1 | Louvain | PV |
| Olly Jay | m | 2015-04-10 | 2015-04-11 | 3 | WIT | 400m, 4x400m |
| Ian Gordon Jefferies | m | 1965-05-19 | 1968-05-11 | 9 | TCD | 120yH, HJ, JTo |
| Jamie Jeffers | m | 2002-11-16 | 2002-12-07 | 2 | UCC | 800m, Road |
| Finbarr Jeffords | m | 1972-05-05 | 1976-05-01 | 9 | UCC | 100m, 200m |
| Nathan Jege | m | 2010-02-13 | 2011-02-05 | 7 | UCC | 100m, 4x100m, LJ, TJ |
| A. Jenkins | m | 1964-05-30 | 1964-05-30 | 1 | AAUE | TJ |
| Robert Jenkins | m | 1996-06-25 | 1996-06-25 | 2 | SU | DT, SP |
| Aindriú Jenkinson | m | 2011-11-12 | 2014-02-07 | 15 | DIT, IUAA | 4x400m, 800m, Road, XC |
| Andrew Jenkinson | m | 2010-11-13 | 2011-04-30 | 4 | DIT | 4x400m, 800m, Road |
| Barry Jenkinson | m | 1996-12-13 | 1996-12-14 | 4 | Carlow RTC | 200m, 60m |
| Cathal Jenkinson | m | 2007-11-17 | 2009-04-25 | 5 | UCD | 1500m, 3000mW, Road, XC |
| B. Jennings | m | 1988-04-29 | 1988-04-30 | 1 | TCE | 400m |
| Emmet Jennings | m | 2010-11-13 | 2015-05-31 | 18 | DCU, IUAA | 3000m, 3000mSC, Road, XC |
| Kian Jennings | m | 2009-03-07 | 2009-03-07 | 1 | UCD | XC |
| M. Jennings | m | 1960-05-15 | 1960-05-15 | 1 | NACA | SP |
| Mark Jennings | m | 2008-11-15 | 2009-03-07 | 3 | UCD | 1500m, Road, XC |
| Seth Jenny | m | 2000-02-26 | 2000-04-15 | 3 | UL | 3000mSC, 5000m, XC |
| Hastings Elliott Jephson | m | 1945-06-30 | 1945-06-30 | 1 | Combined Universities | 440y |
| Irfaan Jetha | m | 2002-04-19 | 2002-04-20 | 1 | RCSI | 200m |
| Chris Jeuken | m | 2014-11-15 | 2014-11-15 | 1 | WIT | Road |
| Will Jo | m | 2012-02-04 | 2012-02-04 | 3 | NUIG | 200m, LJ, SP |
| Alex Johann | m | 2013-02-01 | 2013-04-13 | 4 | UCC | 10000m, 3000m, XC |
| Connor Johnson | m | 2007-11-17 | 2007-11-17 | 1 | TCD | Road |
| Hubert C. Johnson | m | 1912-06-03 | 1912-06-03 | 1 | UCC | 2 Mile Cycle |
| M. Johnson | m | 1995-03-11 | 1995-03-11 | 2 | Birmingham | 400m, 60mH |
| N. Johnson | m | 1982-04-30 | 1982-05-01 | 1 | UCG | 400m |
| Neil Johnson | m | 2013-03-09 | 2018-04-14 | 22 | QUB | 1500m, 3000m, 5000m, Road, XC |
| Richard D.F. Johnson | m | 1914-06-06 | 1914-06-06 | 2 | UCD | 880y, Mile |
| Timothy Robert Johnson | m | 1968-11-30 | 1968-11-30 | 1 | TCD | XC |
| Weldon Johnson | m | 1995-06-17 | 1995-06-20 | 2 | Guest, H & Y | 1500m, 5000m |
| Chris Johnston | m | 2011-04-29 | 2014-03-08 | 7 | UCD | 3000m, 3000mSC, 5000m, Road, XC |
| Christopher Johnston | m | 2012-11-17 | 2013-03-09 | 4 | UCD | 3000m, Road, XC |
| Connor Johnston | m | 2007-12-08 | 2007-12-09 | 2 | TCD | 1500m, 3000m |
| Conor Johnston | m | 2005-11-19 | 2005-11-19 | 1 | TCD | Road |
| E.A. Johnston | m | 1920-06-05 | 1921-06-04 | 3 | QUB | 100y, 220y, 440y |
| Eric I. Johnston | m | 1928-06-02 | 1928-06-02 | 1 | TCD | 880y |
| Gary Johnston | m | 2003-03-09 | 2003-03-09 | 1 | QUB | XC |
| Neil Johnston | m | 2012-07-18 | 2012-07-18 | 1 | Springwell AC | 1500m |
| Percy Herbert Johnston | m | 1873-05-19 | 1873-05-19 | 3 | UCC | 120yH, HJ, PV |
| R. Johnston | m | 1927-06-04 | 1929-06-01 | 5 | QUB | 120yH, DT |
| Richard Johnston | m | 2012-07-18 | 2012-07-18 | 1 | Derry City | 3000m |
| Aidan Jones | m | 2008-11-15 | 2013-03-09 | 4 | UCD | Road, XC |
| Bob Jones | m | 1978-06-30 | 1978-06-30 | 1 | Cornell-Pennsylvania | HJ |
| Dafydd Jones | m | 2013-04-12 | 2014-02-07 | 2 | IT Tallaght | 400m, 800m |
| N. Jones | m | 1967-06-01 | 1967-06-01 | 1 | UCD | 880y |
| Simon Jones | m | 1995-06-20 | 1996-06-25 | 2 | SU | HJ |
| Mike Jonstone | m | 2007-03-31 | 2007-03-31 | 1 | Welsh Universities | XC |
| J. Jordan | m | 1965-06-23 | 1965-06-23 | 2 | AAUE | 100y, 4x110y |
| Louis Jordan | m | 1964-05-30 | 1967-05-27 | 4 | AAUE, Army | DT, HJ, SP |
| Michael Jordan | m | 2018-04-13 | 2018-05-26 | 2 | Ireland, MU | JT |
| P. Jordan | m | 1978-05-05 | 1978-05-06 | 1 | TCD | 400m |
| Padraic Jordan | m | 1976-04-30 | 1977-06-14 | 8 | IUAA, UCG | 400m, LJ, TJ |
| Shane Jordan | m | 2004-01-24 | 2004-02-28 | 2 | TCD | XC |
| Ajith Joy | m | 2019-02-08 | 2019-02-08 | 1 | UU | 60m |
| Brendan Joy | m | 2017-03-04 | 2017-03-04 | 1 | NUIG | XC |
| A. Joyce | m | 1983-05-06 | 1983-05-07 | 3 | UCD | JTo, PV, SP |
| B. Joyce | m | 1985-05-03 | 1985-05-04 | 1 | TCE | TJ |
| Damien Joyce | m | 1997-04-25 | 1999-04-24 | 3 | IT Tallaght, Tralee RTC | 800m |
| Eamon Joyce | m | 2001-12-07 | 2003-04-26 | 7 | UCC | 35lbWfD, DT, HT, JT, SP |
| Eamonn Joyce | m | 2004-04-16 | 2004-04-17 | 2 | Guest | 35lbWfD, DT |
| Eoin Joyce | m | 2007-04-13 | 2008-04-19 | 13 | UCC | 100m, 200m, 4x100m, 4x200m, 4x400m |
| John Joyce | m | 1954-05-22 | 1958-05-18 | 4 | IUAA, UCD | JTo |
| M. Joyce | m | 1978-03-04 | 1978-03-04 | 1 | UCC | XC |
| Owen Joyce | m | 2009-02-14 | 2011-04-30 | 8 | NUIG | 3000m, 400m, DT, JT, LJ, Road, XC |
| Patrick "Paddy" Joyce | m | 1949-05-26 | 1949-05-26 | 1 | UCG | SP |
| Paul Joyce | m | 2015-11-14 | 2015-11-14 | 1 | AIT | Road |
| Ronan Joyce | m | 2010-11-13 | 2010-11-13 | 1 | NUIG | Road |
| Shane Joyce | m | 2017-04-07 | 2018-02-09 | 3 | DCU, IUAA | JT, TJ |
| Tobias Joyce | m | 1946-07-14 | 1946-07-14 | 2 | UCD | HJ, LJ |
| Stephen Judge | m | 1986-03-08 | 1988-03-05 | 3 | UCD | XC |
| Bakr Jundi | m | 2012-11-17 | 2012-11-17 | 1 | RCSI | Road |
| Bryan Just | m | 1995-06-17 | 1995-06-20 | 2 | H & Y | 800m |
| Amy Jackson | f | 2012-07-18 | 2012-07-18 | 1 | Derry City | 800m |
| Elaine Jackson | f | 2002-04-19 | 2002-04-20 | 3 | UCD | DT, HT, SP |
| Sarah Jacobson | f | 2006-11-18 | 2007-02-24 | 2 | TCD | Road, XC |
| Leper Jade | f | 2018-02-09 | 2018-02-09 | 1 | LYIT | SP |
| Claudia Jalon | f | 2017-02-10 | 2017-02-10 | 1 | QUB | 800m |
| Delyth James | f | 2009-03-28 | 2009-03-28 | 1 | Wales | XC |
| Heather Jameson | f | 2016-04-15 | 2016-04-16 | 2 | Guest | 100m, LJ |
| L. Jameson | f | 1983-05-06 | 1984-05-05 | 2 | QUB | DT |
| Hazel Jamieson | f | 2015-05-31 | 2016-05-28 | 3 | SUCA | 4x100m, HJ |
| Vicki Jamison | f | 1993-06-22 | 1999-04-24 | 15 | IUAA, NI U20, NI U23, UU | 100mH, 200m, 400mH, 4x100m, 4x400m |
| Lisa Jeffers | f | 1996-06-25 | 1996-06-25 | 1 | NI U23 | JTo |
| Michelle Jeffrey | f | 1993-06-22 | 1994-06-28 | 2 | SU | 3000m |
| L. Jenkins | f | 1986-05-02 | 1986-05-03 | 1 | UCD | 400m |
| Susan Jenkins | f | 1985-03-09 | 1986-05-03 | 4 | TCE | 3000m, XC |
| Linda Jenkinson | f | 1985-03-09 | 1986-03-08 | 4 | UCD | 400m, 400mH, XC |
| Janine Jensen | f | 2002-04-19 | 2004-04-17 | 14 | IUAA, TCD | 1500m, 4x200m, 800m, 8kgWfD, Road, XC |
| Andrea Johnson | f | 2004-11-20 | 2004-11-20 | 1 | UCD | Road |
| Barbara Johnson | f | 1982-04-30 | 1984-05-05 | 11 | UCC | 100mH, 400mH, 4x100m, HJ, LJ, SP |
| H. Johnson | f | 1969-05-03 | 1969-05-03 | 2 | QUB | HJ, LJ |
| Helen Johnston | f | 1998-06-23 | 1999-06-22 | 3 | SU | 100m, 100mH |
| Valerie Johnston | f | 1993-06-22 | 1994-06-28 | 2 | NI U20 | SP |
| Victoria Johnston | f | 2017-11-18 | 2017-11-18 | 1 | UU | Road |
| A. Johnstone | f | 1977-06-14 | 1977-06-14 | 1 | SU | HJ |
| Hannah Johnstone | f | 2012-07-18 | 2012-07-18 | 1 | BAAC | HJ |
| Athena Jones | f | 1995-06-17 | 1995-06-20 | 2 | H & Y | 100m |
| Caryl Jones | f | 2007-03-31 | 2009-03-28 | 2 | Wales, Welsh Universities | XC |
| E. Jones | f | 1995-06-20 | 1995-06-20 | 1 | H & Y | 400m |
| G. Jones | f | 1993-06-22 | 1993-06-22 | 1 | Guest | 400mH |
| T. Jones | f | 1982-04-30 | 1982-05-01 | 1 | TCE | 100m |
| Adrienne Jordan | f | 1998-02-28 | 2001-11-07 | 6 | Dublin Colleges, President's Select, TCD | Road, XC |
| Emily Jordan | f | 2014-11-15 | 2014-11-15 | 1 | TCD | Road |
| Emily Jordan | f | 2017-02-10 | 2017-04-08 | 5 | AIT | 4x200m, 4x400m, LJ |
| Emily Jordan | f | 2018-02-09 | 2018-04-14 | 5 | AIT | 4x100m, 4x200m, LJ |
| Manon Joris | f | 2018-11-17 | 2018-11-17 | 1 | UCD | Road |
| Aisling Joyce | f | 2016-11-19 | 2018-11-17 | 8 | NUIG | 1500m, 3000m, Road |
| Barbara Joyce | f | 1994-02-19 | 1994-02-19 | 1 | Guest | XC |