| - | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Athlete | Sex | First Appearance | Last Appearance | Appearances | Colleges | Race Types |
|---|---|---|---|---|---|---|
| Sean L'Estrange | m | 2022-01-29 | 2022-04-09 | 4 | TUD | 200m, 4x100m, 60m |
| George Labisch | m | 2003-11-22 | 2004-02-28 | 2 | TCD | Road, XC |
| A. Lacey | m | 1974-05-15 | 1974-05-15 | 2 | UCD | LJ, PV |
| Hugo Lacey | m | 2019-02-08 | 2020-02-15 | 3 | UG | LJ |
| Jove Lachman-Curl | m | 2010-04-23 | 2010-04-24 | 2 | CIT | JT, SP |
| Clement Lacorne | m | 2013-11-23 | 2013-11-23 | 1 | UCC | Road |
| Jack Laczak | m | 2024-10-19 | 2024-11-08 | 2 | MTU | Road, XC |
| Ben Ladomirak | m | 1995-06-17 | 1995-06-20 | 5 | GST, H & Y | DT, HT, SP |
| E. Laffan | m | 1873-05-19 | 1873-05-19 | 1 | UCC | 2 Miles |
| Ignacio Laffey | m | 2019-03-02 | 2019-03-02 | 1 | UL | XC |
| J. Laffey | m | 1936-05-30 | 1936-05-30 | 2 | UCG | 880y, Mile |
| H. Laffin | m | 1934-05-26 | 1934-05-26 | 1 | UCG | 100y |
| Euan Lagan | m | 2019-11-16 | 2022-04-09 | 8 | DCU | 2000mW, 3000m, 3000mW, Road, XC |
| James Lagan | m | 2011-02-05 | 2011-04-30 | 5 | UU | 200m, 35lbWfD, 400m, HT |
| A. Lahiffe | m | 1934-05-26 | 1934-05-26 | 1 | UCG | LJ |
| N.D. Laird | m | 1928-06-02 | 1928-06-02 | 2 | QUB | 880y, Mile |
| Pekka Laitinen | m | 2000-11-12 | 2000-11-12 | 1 | QUB | Road |
| M. Lally | m | 1960-05-15 | 1960-05-15 | 1 | NACA | 880y |
| David Lalor | m | 2015-02-06 | 2016-04-16 | 6 | DCU | 35lbWfD, SP |
| John Lalor | m | 1959-05-17 | 1961-05-14 | 7 | NACA | 100y, 220y, 4x110y |
| Kieran Lambe | m | 1995-02-10 | 2000-02-26 | 24 | IUAA, UCC | 10000m, 1500m, 3000m, 3000mSC, 5000m, Road, XC |
| Chris Lambert | m | 1995-06-17 | 1995-06-20 | 2 | H & Y | 100m, 200m |
| Mael Lambert | m | 2015-11-14 | 2016-03-05 | 5 | TCD | 3000m, 4x200m, Road, XC |
| Michael Lambert | m | 1998-02-28 | 1998-02-28 | 1 | UCC | XC |
| R.W. Lambert | m | 1933-07-10 | 1933-07-10 | 1 | The Rest | 100y |
| Sjoerd Lammers | m | 2009-11-14 | 2009-11-14 | 1 | TCD | Road |
| D. Lammey | m | 1978-05-05 | 1983-05-07 | 4 | QUB | LJ, TJ |
| Tom Lammey | m | 1970-05-09 | 1972-05-06 | 2 | NUU | 100m, TJ |
| A.P. Lamont | m | 1945-06-30 | 1945-06-30 | 1 | Combined Universities | Mile |
| A.P. Lamont | m | 1945-06-30 | 1945-06-30 | 1 | NIAAA Select | 880y |
| J. Lamont | m | 1987-05-08 | 1989-05-06 | 2 | UU | 3000mW |
| Damien Landers | m | 2012-11-17 | 2016-03-05 | 15 | UCD | 1500m, 800m, Road, XC |
| Damien Landers | m | 2017-02-10 | 2019-04-06 | 17 | UG | 10000m, 1500m, 3000m, 5000m, Road, XC |
| Ciaran Lane | m | 2009-11-14 | 2010-02-13 | 2 | UCC | 1500m, Road |
| J. Lane | m | 1969-05-03 | 1969-05-03 | 2 | UCD | JTo, PV |
| John Lane | m | 1963-05-11 | 1969-07-12 | 17 | IUAA, UCD | JTo, PV, SP |
| Luke Lane | m | 2024-04-05 | 2024-04-06 | 1 | DKIT | 4x100m |
| Michael "Mick" Lane | m | 1946-07-14 | 1948-05-22 | 7 | UCC | 100y, 220y, LJ |
| Oisin Lane | m | 2022-01-29 | 2024-10-19 | 5 | UL | 2000mW, 3000mW, XC |
| Richard "Dick" Lane | m | 1947-05-21 | 1948-05-22 | 4 | UCC | 100y, 220y |
| Aleksander Lanecki | m | 2022-11-11 | 2024-11-08 | 4 | DCU | Road, XC |
| Daniel V.A. "Danny" Lang | m | 1975-03-08 | 1977-05-17 | 11 | TCD | 110mH, 400mH, JTo, XC |
| Alex Lange | m | 1994-01-21 | 1994-01-21 | 1 | UCD | HJ |
| Shane Langley | m | 2024-03-09 | 2024-11-08 | 5 | UCC | 400m, 4x400m, Road, XC |
| John Lanigan | m | 2000-12-01 | 2002-04-20 | 3 | WIT | 1500m, 4x400m |
| Mick Lanigan | m | 1958-05-18 | 1960-05-15 | 6 | IUAA, NACA, UCD | 120yH, 4x110y |
| Pte. Mick Lanigan | m | 1961-05-14 | 1967-05-27 | 10 | Army, NACA | 100y, 120yH, 4x110y, HJ |
| Paul Lanson | m | 1999-06-22 | 1999-06-22 | 1 | SU | JT |
| Tomas Lapinskas | m | 2013-02-01 | 2013-04-13 | 4 | CIT | JT, LJ, TJ |
| W.P. Lappin | m | 1927-06-04 | 1927-06-04 | 1 | UCD | Mile |
| John N. Lapraik | m | 1939-07-01 | 1939-07-01 | 1 | Atalanta | 2 Miles |
| J.N. Lapsley | m | 1929-07-03 | 1929-07-03 | 2 | Atalanta | HT, LJ |
| Laurent Lara | m | 2013-11-23 | 2013-11-23 | 1 | DKIT | Road |
| C. Larmour | m | 1986-03-08 | 1986-03-08 | 1 | QUB | XC |
| Joseba Larrarte | m | 2024-11-08 | 2024-11-08 | 1 | MTU | Road |
| S. Larskey | m | 1981-05-01 | 1981-05-02 | 1 | QUB | 5000m |
| François Laruaz | m | 2011-11-12 | 2011-11-12 | 1 | UL | Road |
| Jorge Lasarte Sanz | m | 2023-11-10 | 2023-11-10 | 1 | TUD | Road |
| Tadhg Lattimore | m | 2016-02-12 | 2016-02-12 | 1 | IT Tallaght | 3000m |
| Sean T. Lavan | m | 1923-06-02 | 1928-06-02 | 32 | IUAA, UCD | 100y, 120yH, 220y, 440y, 440y, 220yx2, 880y, 880y, DT |
| A. Lavery | m | 1979-03-17 | 1983-03-12 | 5 | QUB | XC |
| J. Lavery | m | 1980-03-01 | 1986-03-08 | 4 | QUB | XC |
| K. Lavery | m | 1986-03-08 | 1986-03-08 | 1 | UU | XC |
| Andrew Law | m | 1999-11-13 | 2000-11-12 | 2 | NUIM | Road |
| Chris Law | m | 2000-06-20 | 2000-06-20 | 1 | SU | JT |
| Cian Law | m | 2022-11-11 | 2024-11-08 | 9 | DCU | 3000m, 3000mSC, Road, XC |
| Craig Law | m | 2006-12-02 | 2006-12-03 | 1 | UU | SP |
| Denis Law | m | 1952-05-22 | 1952-05-22 | 1 | UCD | 120yH |
| Andrew Lawler | m | 2015-05-31 | 2015-05-31 | 1 | GST | 4x400m |
| Andrew Lawler | m | 2015-05-31 | 2016-05-28 | 3 | SUCA | 1500m, 3000mSC |
| Daniel Lawler | m | 2011-11-12 | 2011-11-12 | 1 | DCU | Road |
| Kevin Lawler | m | 2007-11-17 | 2010-03-13 | 7 | DCU | 10000m, Road, XC |
| Marcus Lawler | m | 2011-04-29 | 2016-04-16 | 42 | GST, IT Carlow | 100m, 200m, 4x100m, 4x200m, 60m |
| Marcus Lawler | m | 2017-04-07 | 2019-04-06 | 25 | IT Carlow | 100m, 200m, 4x100m, 4x200m, 60m |
| Stephen Lawler | m | 2012-02-04 | 2014-11-15 | 8 | DCU | 3000m, Road, XC |
| Peter Thomas Lawless | m | 1981-05-13 | 1988-04-30 | 10 | TCD, UCG | JT, JTo, LJ, PV, XC |
| Shar Lawley | m | 1993-02-12 | 1993-02-12 | 1 | DCU | 400m |
| Alan Lawlor | m | 1997-02-01 | 1997-02-16 | 2 | UCD | XC |
| Cian Lawlor | m | 2022-03-05 | 2022-04-09 | 2 | TUD | 800m, XC |
| Damien Lawlor | m | 1996-02-09 | 1997-02-16 | 6 | TCD | 400m, 400mH, 800m, Road, XC |
| Danny Lawlor | m | 2017-11-18 | 2018-02-09 | 2 | IT Carlow | 800m, Road |
| Jack Lawlor | m | 2021-09-26 | 2023-03-04 | 4 | TCD | Road, XC |
| Sean Lawlor | m | 2017-02-10 | 2017-02-10 | 2 | DCU | 200m |
| Shane Lawlor | m | 1993-02-12 | 1996-04-20 | 20 | DCU, IUAA, UCD | 100m, 200m, 400m, 4x200m, 60m, TJ |
| Jack Lawrie | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | 400m |
| John Burgess Lawson | m | 1964-05-30 | 1965-06-23 | 2 | AAUE | JT |
| Oliver Lawson | m | 2013-06-01 | 2014-05-31 | 3 | SU, SUCA | 100m, 4x100m |
| Paul Lawthor | m | 1977-05-06 | 1978-05-06 | 3 | QUB | 5000m, XC |
| J. Laycock | m | 1933-05-27 | 1934-05-26 | 2 | UCC | 120yH |
| Colm Layton | m | 2017-03-04 | 2017-03-04 | 1 | UCD | XC |
| Pierre le Boulanger | m | 2018-11-17 | 2018-11-17 | 1 | UCD | Road |
| Quentin le Calvez | m | 2017-11-18 | 2017-11-18 | 1 | IT Carlow | Road |
| Mouss Le Guerrier | m | 2012-11-17 | 2013-03-09 | 2 | CIT | Road, XC |
| Craig Leahy | m | 2015-11-14 | 2015-11-14 | 1 | IT Carlow | Road |
| David Leahy | m | 1992-03-07 | 1992-03-07 | 1 | NUIM | XC |
| David Leahy | m | 1994-01-21 | 1994-04-23 | 7 | UCC | 100m, 200m, 60m |
| Domhnail Leahy | m | 2006-04-21 | 2007-04-14 | 3 | GST, UCD | DT, JT |
| Donal Leahy | m | 2004-02-06 | 2004-06-08 | 14 | IUAA, UCD | 100m, 200m, 4x100m, 4x200m, 60m, JT, LJ, SP |
| J. Leahy | m | 1922-06-10 | 1922-06-10 | 1 | UCC | 3 Miles |
| John Paul Leahy | m | 1996-12-13 | 2000-12-02 | 20 | IT Tralee, IUAA, Tralee RTC | 35lbWfD, DT, HT, JT, SP |
| Niall Leamy | m | 2012-11-17 | 2012-11-17 | 1 | UL | Road |
| Hugo Leaney | m | 2004-02-06 | 2008-04-19 | 34 | UCD | 110mH, 400m, 400mH, 4x400m, 60mH, 800m, CE, HJ, LJ, PV, Road, SP, TJ, XC |
| David Leavy | m | 2018-04-13 | 2019-04-06 | 2 | GST | 1500m |
| Paul Leck | m | 2012-07-18 | 2012-07-18 | 1 | Finn Valley Ac | 1500m |
| Arthur Lecron | m | 2023-04-21 | 2023-04-22 | 3 | UCD | 400m, 4x100m, 800m |
| Noleen Leddy | m | 1994-06-28 | 1994-06-28 | 1 | IUAA | 3000mW |
| James Ledingham | m | 2004-02-06 | 2016-11-19 | 32 | UL, WIT | 12, 4, 8, 16, 1500m, 3000m, 4x400m, 800m, Road, XC |
| Alex Lee | m | 2022-01-29 | 2022-04-09 | 3 | GST | 100m, 200m |
| Andrew Lee | m | 2001-04-20 | 2001-04-21 | 4 | QUB | 35lbWfD, DT, HT, SP |
| Jenkans Lee | m | 1998-12-11 | 1998-12-12 | 1 | UU | 60mH |
| Jordan Lee | m | 2019-04-05 | 2019-04-06 | 1 | GST | HJ |
| Jordan Lee | m | 2022-04-08 | 2024-02-10 | 2 | GST | HJ |
| Ken Lee | m | 2000-04-14 | 2001-04-21 | 2 | WIT | 100m |
| Matthew Lee | m | 2023-11-10 | 2024-10-19 | 7 | UCC | 4x400m, 800m, Road, XC |
| Stephen Lee | m | 2015-02-06 | 2015-02-06 | 2 | IADT | 4x200m |
| T. Lee | m | 1925-06-06 | 1926-06-05 | 5 | QUB, UCC | 440y, DT, LJ, SP |
| D. Leen | m | 1921-06-04 | 1921-06-04 | 1 | UCD | Mile |
| Eoin Leen | m | 2002-12-06 | 2004-04-17 | 10 | UCC | 35lbWfD, DT, HT, SP |
| Ben Leen Smith | m | 2019-11-16 | 2024-11-08 | 19 | UCC | 1500m, 3000m, 4x400m, 5000m, Road, XC |
| Eoin Lees | m | 2012-11-17 | 2012-11-17 | 1 | UL | Road |
| Hamish Leeson | m | 2016-05-28 | 2016-05-28 | 2 | SUCA | LJ, TJ |
| John Heatley Leeson | m | 1961-06-01 | 1961-06-01 | 2 | TCD | HJ, PV |
| Robert Leeson | m | 2016-03-05 | 2016-03-05 | 1 | TCD | XC |
| John Lefranco | m | 1999-04-23 | 1999-04-24 | 1 | UU | 5000m |
| Ian Legge | m | 1983-03-12 | 1987-05-09 | 7 | QUB | 1500m, 5000m, XC |
| Tom Leguereau | m | 2022-11-11 | 2022-11-11 | 1 | DCU | Road |
| Mark Lehane | m | 2003-11-22 | 2004-02-28 | 2 | UL | Road, XC |
| Christopher Lehmann | m | 2019-03-02 | 2020-02-15 | 5 | MU | 400m, 4x200m, HJ, XC |
| T. Lenaghan | m | 1990-03-03 | 1990-03-03 | 1 | SPM | XC |
| Nicholas Lendrum | m | 1999-12-03 | 2004-02-07 | 19 | GST, IUAA, QUB | 4x100m, 4x200m, HJ, Road, TJ |
| Edouard Lengronne | m | 2016-11-19 | 2017-04-08 | 3 | AIT | 800m, Road |
| Donncha Lenihan | m | 2008-03-08 | 2010-11-13 | 2 | GST, UG | Road, XC |
| Jonathan Leniston | m | 2009-02-14 | 2011-02-05 | 4 | IT Tralee | 1500m, 3000m, XC |
| Jamie Lennon | m | 2014-11-15 | 2014-11-15 | 1 | UCD | Road |
| Marcus Lennon | m | 2022-01-29 | 2022-04-09 | 3 | IT Carlow | 4x100m, 4x200m |
| Marcus Lennon | m | 2024-02-10 | 2024-02-10 | 1 | SETU | 200m |
| Paul Lennon | m | 2001-04-20 | 2001-04-21 | 1 | UU | 100m |
| R. Lennon | m | 1933-07-10 | 1933-07-10 | 2 | The Rest | 220y, 880y, 220yx2, 440y |
| P. Leonard | m | 1954-05-22 | 1954-05-22 | 1 | UCC | 880y |
| Samuel Lescak | m | 2024-11-08 | 2024-11-08 | 1 | UL | Road |
| Robert Leslie | m | 1994-01-21 | 1996-02-10 | 6 | TCD | 400m, 4x200m, TJ |
| Brian Lester | m | 2014-03-08 | 2014-03-08 | 1 | CIT | XC |
| Leslie Leung | m | 2003-06-10 | 2006-12-03 | 13 | GST, NI U23, UU | 35lbWfD, 4x100m, 4x200m, LJ, TJ |
| G.A. Levis | m | 1939-07-01 | 1939-07-01 | 1 | IUAA | 440y |
| George A. Levis | m | 1933-05-27 | 1935-05-25 | 13 | IUAA, TCD | 100y, 220y, 440y, 880y, 220yx2, 440y, LJ |
| A. Lewis | m | 1994-06-28 | 1994-06-28 | 1 | SU | LJ |
| Mark Lewis | m | 2002-06-18 | 2002-06-18 | 1 | SU | 100m |
| Pete Lewis | m | 1977-06-14 | 1977-06-14 | 1 | Birmingham | 800m |
| Phil Lewis | m | 1994-06-28 | 1994-06-28 | 2 | SU | 100m, 200m |
| Sean Lewis | m | 2011-11-12 | 2012-03-10 | 2 | TCD | Road, XC |
| Paddy Leyden | m | 1996-02-09 | 1996-02-10 | 1 | TCD | 60m |
| Sean Leyden | m | 1996-02-09 | 1996-02-10 | 2 | GST | 400m, HJ |
| Graham Leydon | m | 2013-06-01 | 2013-06-01 | 1 | SU | 100m |
| Patrick Leydon | m | 2019-02-08 | 2020-02-15 | 3 | MU | 200m, 400m |
| Patrick Leydon | m | 2024-04-05 | 2024-04-06 | 3 | UCC | 200m, 4x400m, Mixed 4x400m |
| Brian Liddy | m | 1996-02-09 | 2003-04-26 | 45 | IUAA, TCD, UCD | 200m, 400m, 400mH, 4x100m, 4x200m, 4x400m, 60mH, LJ |
| Tony Lilley | m | 1999-03-06 | 2002-06-18 | 26 | CIT, IUAA | 3000m, 400m, 4x100m, 4x200m, 4x400m, 800m, Road, XC |
| Tony Lilley | m | 2003-04-25 | 2003-04-26 | 1 | UL | 4x400m |
| Gerry Lillis | m | 1946-07-14 | 1947-05-21 | 4 | UCD | 120yH, 440y |
| Rob Lillis | m | 1997-12-12 | 2000-02-05 | 4 | TCD | LJ, Road, TJ, XC |
| R. Limerkins | m | 1971-05-22 | 1971-05-22 | 1 | Louvain | LJ |
| J. Linden | m | 1971-05-07 | 1971-05-08 | 1 | QUB | 1500m |
| Niall Linden | m | 1993-06-22 | 2000-04-15 | 30 | IUAA, NI U20, TCD | 400m, 400mH, 4x200m, 4x400m, 800m, HJ, PV, Road, XC |
| Patrick Linden | m | 2009-11-14 | 2013-11-23 | 6 | QUB | 800m, Road, XC |
| David Lindsay | m | 2014-05-31 | 2014-05-31 | 1 | SUCA | 3000mSC |
| Joshua Lindsay | m | 2019-11-16 | 2024-03-09 | 7 | QUB | Road, XC |
| Nathan Lindsay | m | 2017-11-18 | 2023-03-04 | 8 | QUB, TCD | Road, XC |
| John Francis Linehan | m | 1913-05-24 | 1913-05-24 | 2 | UCC | 440y, LJ |
| Jiimy Linnane | m | 1964-05-30 | 1964-05-30 | 1 | AAUE | 220y |
| Jimmy Linnane | m | 1964-05-30 | 1964-05-30 | 1 | AAUE | 440y |
| Roman Linscheid | m | 1995-06-17 | 1995-06-17 | 1 | Dublin | HT |
| Simon Linscheid | m | 1995-06-17 | 1995-06-17 | 1 | Dublin | HT |
| W. Linton | m | 1920-06-05 | 1920-06-05 | 1 | QUB | SP |
| Harold Lippold | m | 1997-12-12 | 1997-12-13 | 1 | UL | 3000m |
| Stephen Lipson | m | 1993-11-27 | 2002-04-20 | 32 | Dublin Colleges, TCD | 10000m, 2000mW, 3000m, 3000mW, Road, XC |
| Mark Litchfield | m | 2023-11-10 | 2024-02-10 | 3 | DCU | 1500m, Road |
| Brian Little | m | 1957-05-18 | 1958-05-18 | 3 | IUAA, UCD | HJ, LJ |
| Kinwa Liu | m | 2012-02-04 | 2013-11-23 | 5 | IT Carlow, NUIM | 200m, 4x200m, LJ, Road |
| Peter Liu | m | 2006-12-02 | 2007-04-14 | 3 | TCD | HJ, LJ, TJ |
| Ben Livesey | m | 2009-03-28 | 2009-03-28 | 1 | Scotland | XC |
| Alexander Livingston | m | 2015-02-06 | 2017-02-10 | 6 | GST, QUB | PV |
| George W. Livingston | m | 1929-06-01 | 1930-06-07 | 2 | TCD | DT |
| Matthew Livingstone | m | 1997-06-24 | 1997-06-24 | 1 | SU | 5000m |
| Emmanuel Llori | m | 2022-01-29 | 2023-04-22 | 7 | TUD | 100m, 200m, 4x100m, 4x200m |
| Jack Lochans | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | HJ |
| Cathal Locke | m | 2018-04-13 | 2022-04-09 | 14 | UL | 200m, 400m, 400mH, 4x200m, 4x400m |
| Richard Lockhart | m | 2004-06-08 | 2005-06-07 | 4 | GST, NI U23 | HT, SP |
| Rory Lodge | m | 2017-11-18 | 2018-04-14 | 4 | DCU | 800m, Road |
| John Lofranco | m | 1999-03-06 | 1999-04-24 | 2 | UU | 10000m, XC |
| L. Loftus | m | 1952-05-22 | 1952-05-22 | 1 | UCD | LJ |
| Leo Loftus | m | 1958-05-18 | 1958-05-18 | 1 | NACA | LJ |
| P. Loftus | m | 1983-03-12 | 1983-03-12 | 1 | NIHEL | XC |
| Benjamin Logan | m | 2013-06-01 | 2013-06-01 | 2 | SU | DT, SP |
| Jack Logan | m | 2020-02-15 | 2020-03-07 | 5 | QUB | 1500m, 3000m, XC |
| John Logan | m | 1999-04-23 | 1999-04-24 | 1 | GST | TJ |
| Keelan Logan | m | 2022-03-05 | 2022-04-09 | 4 | QUB | 400m, 4x400m, XC |
| David Logue | m | 1969-07-12 | 1969-07-12 | 2 | Edinburgh | 3 Miles, Mile |
| Jordan Logue | m | 2010-11-13 | 2010-11-13 | 1 | DCU | Road |
| Kevin Logue | m | 2019-02-08 | 2019-03-02 | 3 | LYIT | 3000m, XC |
| Cathal Lombard | m | 1995-03-04 | 1998-04-25 | 9 | IUAA, UCC | 3000m, 5000m, Road, XC |
| Fiachra Lombard | m | 1997-02-01 | 2002-04-20 | 10 | IUAA, UCC | 1500m, 5000m, Road, XC |
| Richard Lombard | m | 2006-11-18 | 2009-11-14 | 4 | DCU | Road |
| Giovanni Michael Lombardo | m | 2017-02-10 | 2017-04-08 | 2 | AIT | 2000mW, 3000mW |
| Killian Lonergan | m | 1995-06-17 | 1995-06-17 | 1 | H & Y | 5000m |
| Sean Lonergan | m | 2002-12-06 | 2004-04-17 | 7 | IT Carlow | 4x400m, LJ, TJ, XC |
| Brian Long | m | 2000-02-05 | 2001-02-24 | 3 | TCD | XC |
| Brian Long | m | 1994-01-21 | 1996-04-20 | 13 | IUAA, UL | 110mH, 400m, 400mH, 60mH |
| Craig Long | m | 2024-11-08 | 2024-11-08 | 1 | TUD | Road |
| Eoin Long | m | 2015-11-14 | 2015-11-14 | 1 | TCD | Road |
| Fionnbar "Finny" Long | m | 1971-02-20 | 1976-05-01 | 20 | UCC | 10000m, 1500m, 3000mSC, 5000m, XC |
| G. Long | m | 1936-05-30 | 1938-07-06 | 3 | IUAA, UCD | DT, SP |
| Gear Long | m | 2023-11-10 | 2024-11-08 | 8 | UCC | 1500m, Road, XC |
| George Long | m | 1936-05-30 | 1937-05-22 | 3 | TCD | DT, SP |
| Liam Long | m | 1966-11-19 | 1969-03-01 | 4 | UCC | 3 Miles, XC |
| Pat Long | m | 1980-03-01 | 1982-12-04 | 3 | UCD | XC |
| Ruairi Long | m | 2017-11-18 | 2022-04-09 | 8 | UCD | 3000mSC, Road, XC |
| T. Long | m | 1920-06-05 | 1920-06-05 | 1 | UCD | SP |
| W. Long | m | 1966-05-07 | 1966-05-07 | 1 | UCC | 3 Miles |
| A. Longman | m | 1970-03-14 | 1970-05-09 | 3 | NUU | 800m, XC |
| Craig Longmore | m | 2003-11-22 | 2008-04-19 | 9 | President's Select, UCD | 5000m, Road, XC |
| John Looney | m | 2001-04-07 | 2001-04-07 | 1 | CIT | XC |
| P. Looney | m | 1982-03-06 | 1982-03-06 | 1 | NUU | XC |
| Padraig Looney | m | 2006-11-18 | 2006-11-18 | 1 | TCD | Road |
| Brian Looram | m | 2012-03-10 | 2012-03-10 | 1 | UL | XC |
| Ian Lordan | m | 2013-11-23 | 2015-03-07 | 3 | WIT | Road, XC |
| Barry Lordon | m | 2006-11-18 | 2006-11-18 | 1 | CIT | Road |
| David Lorigan | m | 2007-12-08 | 2010-02-13 | 6 | TCD | 200m, 400m, 4x400m, 60m, LJ |
| Peter Loudon | m | 2013-06-01 | 2013-06-01 | 2 | SU | 4x400m, 800m |
| G. Lough | m | 1995-03-11 | 1995-03-11 | 1 | Loughborough | 3000m |
| Gary Lough | m | 1991-03-02 | 1991-03-02 | 1 | UU | XC |
| John Loughlin | m | 1999-11-13 | 2000-02-26 | 2 | UG | Road, XC |
| Brendan Loughnane | m | 2006-12-02 | 2006-12-03 | 1 | GMIT | 800m |
| Daniel Loughnane | m | 2007-12-08 | 2008-04-19 | 8 | GMIT | 1500m, 400mH, 800m, LJ |
| Eamon Loughnane | m | 2000-12-01 | 2000-12-02 | 1 | DCU | 2000mW |
| G.L. Love | m | 1914-06-06 | 1914-06-06 | 1 | QUB | Mile |
| Kenneth Love | m | 2013-06-01 | 2013-06-01 | 2 | SU | 4x400m, 800m |
| Robert Lindsay Love | m | 1873-05-19 | 1873-05-19 | 4 | UCG | 2 Miles, 440y, 880y, Mile |
| Chris Low | m | 1999-06-22 | 2000-06-20 | 3 | SU | 110mH, HT |
| David Low | m | 2002-06-18 | 2003-06-10 | 3 | SU | 110mH, TJ |
| David Low | m | 2013-06-01 | 2013-06-01 | 1 | SU | 110mH |
| Alasdair Lowe | m | 2016-05-28 | 2016-05-28 | 1 | SUCA | PV |
| John Lowe Woods | m | 1921-06-04 | 1921-06-04 | 1 | TCD | Mile |
| Patrick Lowry | m | 1993-02-12 | 1993-02-12 | 1 | UCD | LJ |
| Patrick "Pat" Lowry | m | 1994-04-22 | 1994-04-23 | 2 | TCD | 200m |
| M. Lox | m | 1971-05-22 | 1971-05-22 | 1 | Louvain | SP |
| Oscar Lubliner | m | 2023-03-04 | 2024-04-06 | 3 | UCD | 10000m, XC |
| Jim Luby | m | 1997-02-01 | 1997-02-01 | 1 | UCG | XC |
| Neal Lucas | m | 1995-06-20 | 1996-06-25 | 3 | NI U23 | 100m, HJ |
| Richard Lucas | m | 2012-04-20 | 2017-04-08 | 29 | WIT | 1500m, 3000m, 4x400m, 800m, LJ, Road, XC |
| Reakwon Lucciano | m | 2022-01-29 | 2022-04-09 | 5 | GMIT | 100m, 200m, 4x100m, 4x400m, 60m |
| Reakwon Lucciano | m | 2024-02-10 | 2024-04-06 | 8 | ATU | 200m, 4x100m, 60m |
| Cpl. Noel Lucey | m | 1961-05-14 | 1961-05-14 | 1 | Army | TJ |
| N. Lucey | m | 1960-05-15 | 1960-05-15 | 1 | NACA | TJ |
| Frank Luh | m | 2005-04-22 | 2005-04-23 | 1 | RCSI | TJ |
| Keith Luke | m | 1995-03-11 | 1995-06-20 | 2 | SU | 800m |
| Alan Lund | m | 2012-04-20 | 2013-04-13 | 2 | CIT | DT, JT |
| Tjerand Tormod Lunde | m | 1961-06-01 | 1962-05-23 | 9 | TCD | 4x110y, HJ, JTo, LJ, PV |
| Stephen Lunn | m | 2022-03-05 | 2024-04-06 | 3 | QUB | 10000m, Road, XC |
| Harry Lupton | m | 2007-02-24 | 2012-04-21 | 3 | IT Sligo | 5000m, XC |
| Henry Lupton | m | 2008-03-08 | 2008-03-08 | 1 | IT Sligo | XC |
| Thomas Lupton | m | 2007-02-24 | 2009-02-15 | 3 | TCD | 12, 4, 8, 16, 3000m, XC |
| Thomas Lupton | m | 2022-11-11 | 2023-04-22 | 3 | DKIT | 5000m, Road, XC |
| Thomas Lupton | m | 2022-03-05 | 2022-04-09 | 3 | DKIT | 3000mSC, 5000m, XC |
| Joshua Lyle | m | 2016-11-19 | 2018-02-09 | 4 | QUB | 3000m, Road |
| Joshua Lyle | m | 2022-03-05 | 2022-03-05 | 1 | QUB | 4x1000m |
| Domhnall Lynam | m | 2018-11-17 | 2020-03-07 | 7 | QUB | 3000m, 5000m, Road, XC |
| Eoin Lynam | m | 2014-11-15 | 2015-04-11 | 4 | WIT | 4x400m, 5000m, Road, XC |
| Martin Lynas | m | 2018-05-26 | 2018-05-26 | 1 | Scotland | 5000m |
| Paul Lynas | m | 1994-06-28 | 2006-04-22 | 79 | GST, IUAA, NI U23, QUB | 100m, 110mH, 200m, 3000mW, 400mH, 4x100m, 4x200m, 4x400m, 60m, 60mH, CE, HJ, LJ, PV, Road, SP, TJ |
| A.J. Lynch | m | 1912-06-03 | 1913-05-24 | 9 | UCD | 100y, 220y, 440y |
| Aaron Lynch | m | 2024-10-19 | 2024-11-08 | 2 | TUS | Road, XC |
| Alan Lynch | m | 2004-02-06 | 2006-12-03 | 14 | UCC | 100m, 200m, 4x100m, 4x200m, 4x400m, 60m, LJ |
| Alex Lynch | m | 2020-03-07 | 2020-03-07 | 1 | UCC | XC |
| Austin Lynch | m | 1995-03-04 | 1995-03-04 | 1 | QUB | XC |
| Austin Michael Lynch | m | 1991-03-02 | 1994-04-23 | 11 | TCD | 1500m, 3000m, 800m, LJ, Road, XC |
| Brendan Lynch | m | 2019-02-08 | 2024-04-06 | 27 | Ireland, UL | 400mH, 4x400m, 60mH, CE, HJ, LJ, SP, TJ |
| Bryan Lynch | m | 2004-02-06 | 2004-02-07 | 1 | LIT | 3000m |
| C. Lynch | m | 1966-03-28 | 1966-03-28 | 1 | NACA | TJ |
| Cameron Lynch | m | 2003-11-22 | 2003-11-22 | 1 | TCD | Road |
| Colm Lynch | m | 1999-04-23 | 2004-04-17 | 35 | IUAA, UL | 100m, 200m, 400m, 400mH, 4x200m, 4x400m |
| Conor Lynch | m | 2002-11-16 | 2004-04-17 | 5 | CIT | 1500m, 5000m, Road, XC |
| Conor Lynch | m | 2016-04-15 | 2016-04-16 | 2 | WIT | 100m, 4x400m |
| Cormac Lynch | m | 2014-02-07 | 2016-04-16 | 23 | UG | 100m, 200m, 35lbWfD, 4x100m, 4x200m, 60m |
| Cormac Lynch | m | 2017-02-10 | 2017-02-10 | 4 | UG | 200m, 4x200m, 60m |
| Cormac Lynch | m | 2018-02-09 | 2018-04-14 | 6 | UG | 100m, 200m, 4x200m, 60m |
| Craig Lynch | m | 2009-04-24 | 2014-04-12 | 20 | DCU | 200m, 400m, 4x100m, 4x200m, 4x400m, 60m, Road |
| Cullen Lynch | m | 2012-11-17 | 2017-03-04 | 21 | CIT, IUAA | 1500m, 4x400m, 800m, Road, XC |
| Daniel Lynch | m | 2016-05-28 | 2016-05-28 | 1 | SUCA | 3000mSC |
| Darragh Lynch | m | 2012-03-10 | 2016-04-16 | 18 | DCU, IUAA, WIT | 1500m, 400m, 800m, Road, XC |
| David Lynch | m | 1981-03-07 | 1983-05-07 | 9 | UCD | 1500m, 800m, XC |
| David Lynch | m | 2013-02-01 | 2013-04-13 | 3 | CIT | 35lbWfD, SP |
| Dean Lynch | m | 2023-11-10 | 2023-11-10 | 1 | UCC | Road |
| Evan Lynch | m | 2024-10-19 | 2024-11-08 | 2 | TCD | Road, XC |
| Evan Lynch | m | 2015-02-06 | 2016-02-12 | 3 | UL | 2000mW, 3000mW |
| Evan Lynch | m | 2017-04-07 | 2018-02-09 | 2 | UL | 2000mW, 3000mW |
| G. Lynch | m | 1967-05-27 | 1967-05-27 | 1 | BLE | TJ |
| James Lynch | m | 2023-04-21 | 2024-04-06 | 3 | UCD | 5000m |
| Ken Lynch | m | 1995-06-17 | 1995-06-17 | 1 | GST | 5000m |
| Killian Lynch | m | 2021-09-26 | 2023-03-04 | 3 | IT Tralee, MTU | 5000m, XC |
| Killian Lynch | m | 2023-04-21 | 2023-04-22 | 1 | MTU | 5000m |
| M. Lynch | m | 1989-03-04 | 1989-03-04 | 1 | Cork RTC | XC |
| Michael Lynch | m | 2009-11-14 | 2011-03-12 | 4 | UCC | Road, XC |
| Owen Lynch | m | 2001-12-07 | 2001-12-08 | 1 | IT Tralee | 1500m |
| Owen F.M. Lynch | m | 1977-03-12 | 1980-03-01 | 8 | TCD | 1500m, 3000mSC, XC |
| P. Lynch | m | 1970-03-14 | 1973-03-10 | 4 | SPM | XC |
| Pat Lynch | m | 2006-12-02 | 2006-12-03 | 1 | UL | SP |
| Patrick Lynch | m | 2015-02-06 | 2019-04-06 | 39 | IUAA, WIT | 100m, 200m, 4x100m, 4x200m, 4x400m, 60m |
| Peter Lynch | m | 2016-11-19 | 2016-11-19 | 1 | UL | Road |
| Stephen Lynch | m | 2005-11-19 | 2008-03-08 | 17 | CIT | 400m, 400mH, 4x200m, 800m, CE, HJ, LJ, Road, SP, XC |
| Gareth Lyness | m | 2012-07-18 | 2012-07-18 | 1 | North Down AC | 400m |
| Ciaran Lyng | m | 2009-03-07 | 2009-11-14 | 2 | TCD | Road, XC |
| Gary Lynn | m | 1998-06-23 | 1998-06-23 | 1 | NI U23 | 200m |
| Nathan Lynott | m | 2024-11-08 | 2024-11-08 | 1 | TUS | Road |
| Sam Lyon | m | 2013-06-01 | 2014-05-31 | 5 | SU, SUCA | 4x100m, LJ, TJ |
| Alexander "Alec" Lyons | m | 1939-05-27 | 1939-05-27 | 1 | UCD | LJ |
| Conor Lyons | m | 2012-11-17 | 2012-11-17 | 1 | UG | Road |
| D.J. Lyons | m | 1922-06-10 | 1922-06-10 | 2 | UCC | 880y, Mile |
| Eoin Lyons | m | 2015-11-14 | 2018-02-09 | 9 | AIT | 1500m, 4x400m, 800m, Road, XC |
| Frank Lyons | m | 2000-04-14 | 2000-04-15 | 1 | RCSI | 400m |
| J. Lyons | m | 1983-03-12 | 1983-03-12 | 1 | SPM | XC |
| Jeremy Lyons | m | 1995-04-21 | 1997-04-26 | 24 | GST, IUAA, Waterford RTC, WIT | 110mH, 400m, 400mH, 4x200m, 60mH |
| Joe Lyons | m | 2016-11-19 | 2019-04-06 | 13 | DCU | 1500m, 800m, Road, XC |
| John Lyons | m | 2013-11-23 | 2013-11-23 | 1 | CIT | Road |
| Lorcan Lyons | m | 1999-12-03 | 2003-11-22 | 13 | TCD | 200m, 400m, 4x200m, 4x400m, LJ, Road, TJ, XC |
| M. Lyons | m | 1968-11-30 | 1968-11-30 | 1 | UCD | XC |
| Oisin Lyons | m | 2006-11-18 | 2006-11-18 | 1 | TCD | Road |
| Peter Lyons | m | 1991-05-03 | 1992-04-25 | 4 | UCD | 100m, 200m |
| Peter Lyons | m | 1995-06-17 | 1995-06-17 | 1 | Dublin | 200m |
| Tommy Lyons | m | 2004-02-06 | 2005-12-11 | 12 | UCD | 200m, 4x200m, 60m, 60mH, LJ |
| Vincent Lyons | m | 2009-11-14 | 2009-11-14 | 1 | TCD | Road |
| Thomas Lyp | m | 2019-11-16 | 2019-11-16 | 1 | UCC | Road |
| Liam Seorse Lysaght | m | 1982-03-06 | 1983-05-07 | 3 | TCD | 1500m, XC |
| John Lyster | m | 1989-03-04 | 1989-05-06 | 3 | QUB | 800m, XC |
| J.A. Lyttle | m | 1945-06-30 | 1945-06-30 | 2 | NIAAA Select | 100y, 220y |
| Juliette Labrousse | f | 2019-11-16 | 2019-11-16 | 1 | TCD | Road |
| Eve Lacey | f | 2018-11-17 | 2018-11-17 | 1 | MU | Road |
| Joanna Lacey | f | 1993-11-27 | 1993-11-27 | 1 | UCD | Road |
| Charlotte Lahaye | f | 1999-11-13 | 2000-02-26 | 2 | NUIM | Road, XC |
| Michelle Lahert | f | 2015-11-14 | 2015-11-14 | 1 | UG | Road |
| Sarah Lahiff | f | 2016-02-12 | 2019-05-25 | 10 | DIT, GST, Ireland | 200m, 400m, 4x400m |
| Rita Lahue | f | 2020-02-15 | 2020-02-15 | 2 | UG | 200m, 60m |
| Tara Lal | f | 1993-06-22 | 1993-06-22 | 1 | SU | TJ |
| Alanna Lally | f | 2015-11-14 | 2019-02-08 | 9 | UCD | 1500m, 400m, 4x400m, 800m, Road |
| Anna Lalor | f | 2023-01-28 | 2024-04-06 | 6 | UCD | 100m, 100mH, 200m, 60m, 60mH |
| Aoife Lalor | f | 2023-11-10 | 2023-11-10 | 1 | DCU | Road |
| Eleanor Margaret Lamb | f | 1974-05-03 | 1976-05-11 | 18 | TCD | 100m, 200m, 400m, 4x100m, DT, JT, JTo, LJ, SP |
| Caroline Lambe | f | 2005-04-22 | 2005-04-23 | 1 | DCU | 400mH |
| Joanne Lambe | f | 2001-04-07 | 2001-04-07 | 1 | CIT | XC |
| M. Lambe | f | 1979-03-17 | 1980-03-01 | 2 | QUB | XC |
| Sinead Lambe | f | 2017-11-18 | 2018-03-10 | 2 | DCU | Road, XC |
| Chloe Lambert | f | 2014-05-31 | 2014-05-31 | 4 | SUCA | 100m, 200m, 4x100m, 4x400m |
| Emma Landers | f | 2023-11-10 | 2024-04-06 | 5 | DCU | 1500m, Mile, Road |
| Ida Landgraff | f | 2010-11-13 | 2012-03-10 | 2 | UG | Road, XC |
| Caoimhe Landy | f | 2016-11-19 | 2018-02-09 | 4 | TCD | 100m, LJ, Road |
| Aishling Lane | f | 2024-10-19 | 2024-11-08 | 2 | UG | Road, XC |
| J. Lane | f | 1989-05-05 | 1989-05-06 | 3 | UCC | 100mH, 400mH, LJ |
| Jennifer Lane | f | 2017-02-10 | 2019-02-08 | 5 | UCC | 4x200m, 60m, LJ |
| Sarah Lane | f | 2022-01-29 | 2024-02-10 | 10 | DCU | 4x400m, 800m, Road |
| Cara Langan | f | 1996-02-09 | 1996-02-10 | 1 | UCG | 200m |
| Cora Langan | f | 1996-02-09 | 1996-02-10 | 1 | UCG | LJ |
| Patricia Lange | f | 2009-11-14 | 2013-04-13 | 22 | CIT | 20lbWfD, 3000m, 4x100m, 4x400m, 800m, CE, DT, HJ, HT, JT, LJ, Road, SP, XC |
| Laura Langton | f | 2012-02-04 | 2013-02-01 | 10 | DCU | 60mH, CE, HJ, LJ, SP |
| Martina Lanigan | f | 2000-04-14 | 2001-04-21 | 3 | WIT | 1500mW |
| Mary Kate Lanigan | f | 2011-02-05 | 2012-02-04 | 7 | DCU | 4x200m, CE, HJ, LJ, SP |
| Ann-Marie Lannigan | f | 2013-11-23 | 2013-11-23 | 1 | CIT | Road |
| Sarah Lannigan | f | 2017-11-18 | 2020-02-15 | 10 | UG | 4x400m, 800m, Road |
| Ann-Marie Larkin | f | 1999-03-06 | 1999-03-06 | 1 | GST | XC |
| Cathy Larkin | f | 1999-12-03 | 1999-12-04 | 1 | IT Carlow | 1500m |
| Ellen Larkin | f | 2017-02-10 | 2017-05-27 | 3 | IUAA, UL | PV |
| Margaret Larkin | f | 1977-03-12 | 1980-05-03 | 16 | NCPE, TCE | 400m, 800m, DT, SP, XC |
| Naoibh Larkin | f | 2004-02-06 | 2004-02-07 | 2 | UL | 1500mW, TJ |
| Niamh Larkin | f | 1999-04-23 | 1999-04-24 | 1 | WIT | 1500mW |
| Camilla Larsen | f | 2002-04-19 | 2002-04-20 | 1 | RCSI | 1500mW |
| A. Lasgrave | f | 1992-04-24 | 1992-04-25 | 2 | UCC | 400m, 400mH |
| Aoife Laste | f | 2015-11-14 | 2016-03-05 | 2 | DCU | Road, XC |
| Linsay Lathinghouse | f | 2001-11-07 | 2001-11-07 | 1 | NUIM | Road |
| Nana Latifat A. Adeniyi | f | 2012-02-04 | 2012-02-04 | 1 | UCD | 60m |
| Nadine Lattimore | f | 2012-04-20 | 2013-04-13 | 3 | GST | DT, SP |
| Kerry Lauder | f | 2000-06-20 | 2000-06-20 | 4 | SU | 100m, 800m, LJ, TJ |
| Kea Lavelle | f | 2024-11-08 | 2024-11-08 | 1 | UL | Road |
| R. Lavelle | f | 1978-03-04 | 1980-03-01 | 3 | NUU | XC |
| Emma Laverty | f | 2017-11-18 | 2017-11-18 | 1 | QUB | Road |
| Eva Laverty | f | 2012-11-17 | 2015-11-14 | 5 | UCD | 1500m, Road, XC |
| Sarah Lavery | f | 2014-03-08 | 2014-03-08 | 1 | UU | XC |
| Ciara Lavin | f | 1993-03-06 | 1997-02-01 | 11 | TCD | 1500m, 3000m, 800m, Road, SP, XC |
| Emer Lavin | f | 1993-03-06 | 1993-12-04 | 2 | UCC, UCD | XC |
| Liah Lavin | f | 2015-04-10 | 2015-04-11 | 1 | IT Carlow | 4x100m |
| M. Lavin | f | 1975-03-08 | 1975-03-08 | 1 | TCD | XC |
| Sarah Lavin | f | 2011-04-29 | 2018-02-09 | 19 | GST, UCD | 100m, 100mH, 200m, 4x100m, 4x200m, 60m, 60mH |
| Sarah Lavin | f | 2019-02-08 | 2019-02-08 | 2 | UCD | 60mH |
| Vitalija Lavreckyte | f | 2013-06-01 | 2013-06-01 | 1 | SU | JT |
| Karen Law | f | 2005-12-10 | 2007-04-14 | 4 | UU | 200m, 3000m, 4x200m, LJ |
| Kirstie Law | f | 1996-06-25 | 1996-06-25 | 1 | SU | 100m |
| Deborah Lawal | f | 2024-04-05 | 2024-04-06 | 2 | UCD | JT, SP |
| Aoibhinn Lawler | f | 2018-03-10 | 2018-03-10 | 1 | DCU | XC |
| Doireann Lawler | f | 2001-11-07 | 2003-03-09 | 3 | UCC | Road, XC |
| Grace Lawler | f | 2019-04-05 | 2022-01-29 | 6 | AIT | 100m, 4x100m, 4x200m, 60m, LJ |
| Grace Lawler | f | 2024-02-10 | 2024-02-10 | 3 | TUS | 4x200m, 60m |
| Hannah Lawler | f | 2014-05-31 | 2014-05-31 | 1 | SAL Select | PV |
| Hannah Lawler | f | 2016-05-28 | 2018-05-26 | 2 | Scotland, SUCA | PV |
| Caroline Lawless | f | 2013-11-23 | 2016-03-05 | 7 | TCD | Road, XC |
| Aisling Lawlor | f | 1999-04-23 | 1999-12-04 | 6 | CIT | 100m, 4x100m, 4x200m, LJ |
| Doireann Lawlor | f | 2000-12-01 | 2005-04-23 | 5 | UCC | 1500mW |
| Grace Lawlor | f | 2017-02-10 | 2017-04-08 | 12 | AIT | 100m, 200m, 4x100m, 4x200m, 4x400m, 60m |
| Grace Lawlor | f | 2018-02-09 | 2018-04-14 | 7 | AIT | 100m, 200m, 4x100m, 4x200m, 60m |
| Sandra Lawlor | f | 2010-02-13 | 2013-06-01 | 18 | DCU, IUAA | 100mH, 4x100m, 4x200m, 60m, 60mH, HJ, LJ, TJ |
| Sarah Lawlor | f | 2018-02-09 | 2019-04-06 | 16 | CIT | 100mH, 4x100m, 60mH, CE, HJ, LJ, SP, TJ |
| Stephanie Lawrie | f | 2015-05-31 | 2015-05-31 | 2 | SUCA | 1500m, 3000m |
| Katie Leach | f | 2015-02-06 | 2015-04-11 | 2 | QUB | 3000m, 5000m |
| Ciara Leacy | f | 2013-04-12 | 2015-02-06 | 9 | UCD | 100m, 200m, 400m, 4x200m, 4x400m, 60m, Road |
| Gemma Leahy | f | 2007-03-31 | 2007-03-31 | 1 | Welsh Universities | XC |
| Jade Leahy | f | 2015-02-06 | 2016-04-16 | 3 | DCU | 400m, 4x400m |
| Roisin Leahy | f | 2012-11-17 | 2013-03-09 | 2 | DCU | Road, XC |
| Sarah Leahy | f | 2019-04-05 | 2019-04-06 | 3 | UL | 100m, 4x100m |
| Sarah Leahy | f | 2022-01-29 | 2023-04-22 | 16 | UL | 100m, 200m, 20lbWfD, 4x100m, 4x200m, 4x400m, 60m |
| Emma Leask | f | 2014-05-31 | 2014-05-31 | 1 | SUCA | 400m |
| Erinn Leavy | f | 2024-11-08 | 2024-11-08 | 1 | QUB | Road |
| Eileen Lechy | f | 2015-11-14 | 2015-11-14 | 1 | UCC | Road |
| F. Leckey | f | 1989-05-05 | 1989-05-06 | 1 | TCE | 200m |
| Noeleen Leddy | f | 1996-04-19 | 1996-04-20 | 1 | SPM | 1500mW |
| Noleen Leddy | f | 1994-04-22 | 1994-04-23 | 1 | SPM | 1500mW |
| Ann Lee | f | 1969-05-03 | 1974-05-04 | 26 | UCD | 100mH, 100yH, 220y, 400m, 4x100m, 4x110y, 880y, DT, HJ, LJ, SP, XC |
| Ann Lee | f | 1972-05-05 | 1972-05-06 | 2 | SPM | HJ, SP |
| F. Lee | f | 1981-03-07 | 1981-03-07 | 1 | UCG | XC |
| Louise Lee | f | 1990-03-03 | 1991-03-02 | 2 | SPM | XC |
| Shannen Lee | f | 2019-11-16 | 2020-03-07 | 2 | UG | Road, XC |
| Thera Lee | f | 1998-02-28 | 1998-02-28 | 1 | UG | XC |
| V. Lee | f | 1976-03-06 | 1976-03-06 | 1 | NUU | XC |
| Orlagh Leer | f | 2023-04-21 | 2024-04-06 | 8 | QUB | 200m, 400m, 4x200m, Mixed 4x400m |
| Eileen Lehane | f | 1995-03-04 | 1995-03-04 | 1 | UL | XC |
| Mary Lehane | f | 1975-03-08 | 1976-03-06 | 2 | UCC | XC |
| Charlotte Lehaye | f | 2000-11-12 | 2000-11-12 | 1 | NUIM | Road |
| Claire Leheny | f | 1994-01-21 | 1994-01-21 | 1 | TCD | 3000m |
| Eliza Lehman | f | 2022-04-08 | 2022-04-09 | 1 | QUB | 5000m |
| Rebecca Leitch | f | 2000-06-20 | 2004-06-08 | 12 | IUAA, NI U23, QUB | 100m, 200m, 400m, 4x100m, 4x400m, 60m, LJ |
| Charlotte Leman | f | 2023-11-10 | 2024-11-08 | 5 | MU | 1500m, Road, XC |
| Emma Lemieux | f | 2018-02-09 | 2018-02-09 | 1 | IT Carlow | 200m |
| G. Lenane | f | 1980-03-01 | 1980-03-01 | 1 | UCC | XC |
| Eilish Lenihan | f | 1995-12-16 | 1995-12-16 | 1 | TCD | XC |
| Noelle Lenihan | f | 2016-04-15 | 2016-04-16 | 1 | GST | DT |
| Noelle Lenihan | f | 2018-02-09 | 2019-04-06 | 3 | MU | DT, SP |
| Donna Lennon | f | 1994-06-28 | 2005-06-07 | 66 | GST, IUAA, NI U20, NI U23, QUB | 100m, 200m, 4x100m, 4x200m, 4x400m, 60m, HJ, LJ, PV, TJ |
| Kerri Lennon | f | 1998-12-11 | 2002-12-07 | 10 | QUB | 4x100m, 4x200m, LJ |
| Sylvia Lennon | f | 1996-02-09 | 2001-04-21 | 13 | UCD | 1500mW, 4x200m, JT |
| Annie Leonard | f | 1986-05-02 | 1988-04-30 | 7 | NUU, UU | 200m, 400m, 400mH, 800m, JTo, LJ |
| Aoife Leonard | f | 2023-01-28 | 2023-01-28 | 1 | UCC | 60m |
| R. Leonard | f | 1989-05-05 | 1989-05-06 | 5 | UU | 100mH, 200m, 400mH, LJ |
| Y. Leonard | f | 1992-04-24 | 1992-04-25 | 1 | UCG | 3000m |
| Yvonne Leonard | f | 1992-03-07 | 1993-04-24 | 2 | UCC | 1500mW, XC |
| B Lernihan | f | 1994-01-21 | 1994-01-21 | 1 | Cork RTC | SP |
| Renee Letz | f | 2016-11-19 | 2021-11-13 | 17 | GST, Ireland, UCD | 1500m, 4x400m, 800m, Road, XC |
| Amelie Leventi | f | 2013-11-23 | 2013-11-23 | 1 | UCC | Road |
| Deirdre Levin | f | 1982-03-06 | 1982-03-06 | 1 | TCE | XC |
| Deborah Levy | f | 1995-06-17 | 1995-06-20 | 3 | GST, H & Y | HJ, SP |
| A. Lewis | f | 1972-03-04 | 1974-05-04 | 6 | QUB | 1500m, 800m, LJ, XC |
| F. Lewis | f | 1995-03-11 | 1995-03-11 | 2 | Loughborough | 60m, LJ |
| Hannah Lewis | f | 2005-06-07 | 2005-06-07 | 2 | NI U23 | 100m, LJ |
| Moya Leydon | f | 2017-04-07 | 2017-04-08 | 1 | IT Sligo | DT |
| Shauna Leydon | f | 2022-01-29 | 2023-01-28 | 8 | UCD | 200m, 4x200m, 800m |
| Shauna Leydon | f | 2023-11-10 | 2024-11-08 | 4 | UG | 800m, Road, XC |
| Xu Li | f | 2009-11-14 | 2011-04-30 | 7 | UU | 1500m, 800m, Road, XC |
| D. Liddy | f | 1980-05-02 | 1980-05-14 | 2 | UCD | 100mH |
| Louise Liley | f | 2007-11-17 | 2007-11-17 | 1 | CIT | Road |
| M. Lillis | f | 1975-03-08 | 1975-03-08 | 1 | UCG | XC |
| Diane Lilly | f | 2009-03-07 | 2009-03-07 | 1 | CIT | XC |
| Anne Linden | f | 2013-03-09 | 2015-05-31 | 5 | IUAA, TCD | 3000m, 5000m, Road, XC |
| Ann Lindsay | f | 1980-05-02 | 1983-05-07 | 15 | UCD | DT, JT, SP |
| Silje Lindstad | f | 2021-11-13 | 2022-03-05 | 2 | UCD | Road, XC |
| Mary Linehan | f | 1995-04-21 | 1995-04-22 | 1 | UL | 800m |
| Hannah Linney | f | 2015-11-14 | 2017-11-18 | 6 | TCD | 5000m, Road, XC |
| Lisbeth Lintner | f | 2022-11-11 | 2022-11-11 | 1 | MU | Road |
| Rose Linton | f | 1971-05-07 | 1974-05-04 | 18 | IUAA, QUB | DT, HJ, JTo, LJ, SP |
| W. Little | f | 1967-05-05 | 1967-05-05 | 2 | TCD | 100y, SP |
| Catherine Llewellyn | f | 1979-03-17 | 1980-05-03 | 8 | TCD | 1500m, 400m, 800m, XC |
| Karen Lloyd | f | 1998-04-24 | 1998-04-25 | 1 | UL | 5000m |
| Paula Lloyd | f | 1977-06-14 | 1977-06-14 | 1 | SU | 400m |
| Shona Lockhart | f | 2003-06-10 | 2004-06-08 | 2 | NI U23 | LJ |
| M. Lockman | f | 1979-05-04 | 1979-05-05 | 1 | UCD | 3000m |
| S. Lockwood | f | 1972-05-05 | 1972-05-06 | 6 | UCC | 100m, 100mH, 200m, DT, LJ, SP |
| Clodagh Loftus | f | 1993-02-12 | 1993-12-04 | 2 | TCD | 3000m, XC |
| Joanne Loftus | f | 2023-01-28 | 2024-10-19 | 7 | TCD | 1500m, 3000m, 5000m, XC |
| Majella Loftus | f | 1995-12-16 | 1996-04-20 | 3 | UCD | 1500m, DT, XC |
| Roisin Loftus | f | 2015-11-14 | 2016-11-19 | 2 | TCD | Road |
| S. Logan | f | 1977-05-06 | 1979-05-23 | 7 | UCD | 100m, 200m |
| Patricia Logue | f | 2003-11-22 | 2006-03-04 | 3 | UU | Road, XC |
| Chiara Lohrig | f | 2022-11-11 | 2022-11-11 | 1 | MU | Road |
| Martina Lonergan | f | 2000-02-26 | 2000-02-26 | 1 | WIT | XC |
| Siobhan Mary Lonergan | f | 1975-12-13 | 1978-05-06 | 15 | TCD | 1500m, 3000m, 800m, JT, XC |
| Audrey Long | f | 1977-06-14 | 1977-06-14 | 1 | BLE Select | HJ |
| Christine Long | f | 1996-06-25 | 2005-06-07 | 22 | GST, IUAA, NI U23, QUB | 1500m, 400m, 4x100m, 4x400m, 800m, Road, XC |
| Roisin Long | f | 2014-11-15 | 2019-03-02 | 11 | UCD | 3000mSC, Road, XC |
| Rosie Long | f | 1971-05-07 | 1973-05-12 | 2 | UCC | 400m, 4x100m |
| K. Looney | f | 1979-03-17 | 1979-03-17 | 1 | UCG | XC |
| Orla Looney | f | 2024-10-19 | 2024-11-08 | 2 | UCD | Road, XC |
| Carol Loscher | f | 2005-12-10 | 2005-12-11 | 4 | TCD | 20lbWfD, LJ, PV, SP |
| C. Loughan | f | 1976-03-06 | 1976-03-06 | 1 | TCD | XC |
| Heather Lougheed | f | 2013-03-09 | 2013-03-09 | 1 | DCU | XC |
| Laura Loughlin | f | 2006-12-02 | 2011-04-30 | 12 | QUB | 20lbWfD, 4x100m, LJ, Road, SP, TJ |
| Eimear Loughman | f | 2017-11-18 | 2018-11-17 | 3 | IT Carlow | 800m, Road |
| Aishling Loughnane | f | 2002-11-16 | 2003-03-09 | 3 | GST, UL | 3000m, Road, XC |
| Ann Loughnane | f | 2004-02-06 | 2006-12-03 | 6 | UG | 1500mW |
| Claudia Loughnane | f | 2014-02-07 | 2014-04-12 | 2 | UL | 1500mW |
| Olive Loughnane | f | 1994-04-22 | 1997-12-13 | 7 | UCC, UCG | 1500mW, XC |
| Linda Low | f | 1994-06-28 | 1994-06-28 | 4 | SU | DT, HT, JTo, SP |
| Shona Lowe | f | 2014-02-07 | 2024-04-06 | 71 | Ireland, IUAA, UCC | 100m, 200m, 4x100m, 4x200m, 4x400m, 60m, Road |
| D. Lowry | f | 1989-05-05 | 1989-05-06 | 1 | UU | 100m |
| Hannah Lowry-O'Reilly | f | 2010-04-23 | 2010-11-13 | 2 | TCD | 400mH, Road |
| Megan Lsaac | f | 2016-03-05 | 2016-03-05 | 1 | UCC | XC |
| M. Lucey | f | 1989-03-04 | 1990-03-03 | 2 | Cork RTC | XC |
| Margaret Lucey | f | 1995-03-04 | 1999-03-06 | 15 | Queen's Select, UCC, UCD | 1500m, 3000m, 400mH, 4x200m, 800m, TJ, XC |
| Y. Lucey | f | 1995-04-21 | 1995-04-22 | 1 | Unknown | JTo |
| Joyce Lundberg | f | 1973-05-11 | 1974-05-15 | 7 | TCD | HJ, LJ |
| Orla Lundy | f | 2021-11-13 | 2024-03-09 | 5 | QUB | Road, XC |
| Orla Lunely | f | 2022-03-05 | 2022-03-05 | 1 | QUB | 4x1000m |
| Sinead Lusby | f | 1991-03-02 | 1996-04-20 | 16 | IUAA, TCE, UL | 10000m, 1500m, 3000m, 800m, Road, XC |
| Caoimhe Lynam | f | 2019-04-05 | 2019-05-25 | 4 | DCU, Ireland | 400m, 4x400m |
| Ann-Marie Lynch | f | 1989-03-04 | 1992-03-07 | 2 | UCD | XC |
| Anne-Marie Lynch | f | 2001-12-07 | 2002-04-20 | 6 | UCD | 100m, 400m, 4x100m, 4x200m, SP |
| Anne-Marie Lynch | f | 1988-03-01 | 1988-03-01 | 1 | UCD | XC |
| Aoife Lynch | f | 2018-02-09 | 2020-02-15 | 20 | DCU | 100m, 200m, 4x100m, 4x200m, 60m |
| Deirdre Lynch | f | 1991-03-02 | 1991-03-02 | 1 | TCE | XC |
| Eimear Lynch | f | 2013-02-01 | 2017-05-27 | 39 | GST, IUAA, WIT | 200m, 400m, 4x100m, 4x200m, 4x400m |
| Gemma Lynch | f | 2017-04-07 | 2017-04-08 | 1 | UG | HT |
| Grace Lynch | f | 2012-11-17 | 2017-04-08 | 21 | UL | 1500m, 3000m, 4x400m, 800m, Road, XC |
| Isabelle Lynch | f | 2022-11-11 | 2022-11-11 | 1 | TUD | Road |
| Kim Lynch | f | 2002-04-19 | 2002-04-20 | 1 | NUIM | 5000m |
| Laura Lynch | f | 2014-02-07 | 2014-04-12 | 3 | UCC | LJ, TJ |
| Lorraine Lynch | f | 1999-12-03 | 1999-12-04 | 1 | UL | 1500mW |
| Maria Lynch | f | 1998-04-24 | 2001-04-21 | 8 | DIT | 1500m, 3000m, 4x400m, 800m, Road, XC |
| Meghan Lynch | f | 2024-02-10 | 2024-04-06 | 6 | UG | 100m, 4x100m, 4x200m, 60m |
| Pamela Lynch | f | 2011-03-12 | 2011-03-12 | 1 | TCD | XC |
| Rachel Lynch | f | 2022-04-08 | 2022-04-09 | 1 | WIT | JT |
| Vivien Lynch | f | 1988-02-01 | 1990-04-28 | 9 | UCD | 10000m, 1500m, 1500mW, 3000m, Road, XC |
| Emily Lyne | f | 2024-02-10 | 2024-04-06 | 7 | UCD | 200m, 400mH, 4x400m, 60mH, Mixed 4x400m |
| L. Lyness | f | 1970-03-14 | 1970-05-09 | 3 | QUB | 100m, 400m, XC |
| Jane E.B. Lynham | f | 1977-05-06 | 1979-05-23 | 7 | TCD | 100m, 100mH, 200m, LJ |
| A. Lyons | f | 1974-05-03 | 1974-05-04 | 1 | NCPE | 400m |
| A. Lyons | f | 1975-05-02 | 1975-05-03 | 1 | UCG | 400m |
| Ann Lyons | f | 1981-05-01 | 1983-05-07 | 4 | TCE | 400m, 400mH, XC |
| Breda Lyons | f | 2011-03-12 | 2011-03-12 | 1 | UG | XC |
| C. Lyons | f | 1986-03-08 | 1986-03-08 | 1 | NIHED | XC |
| J. Lyons | f | 1974-05-03 | 1975-05-03 | 2 | TCD | 100mH |
| Jane Mary Lyons | f | 1974-05-15 | 1977-05-17 | 9 | TCD | 100m, 100mH, 400m, 4x100m |
| Patricia Lyons | f | 1995-06-17 | 1995-06-20 | 7 | H & Y, Harvard | DT, HT, JT, JTo, SP |
| T. Lyons | f | 1974-05-03 | 1976-05-01 | 4 | NCPE | 100mH, HJ |
| Fionnuala Lysaght | f | 1968-03-02 | 1971-02-20 | 10 | UCG | 100y, 200m, 400m, 440y, 4x100m, XC |
| P. Lyses | f | 1967-05-05 | 1967-05-05 | 1 | UCG | 220y |
| Ruth Lyttle | f | 2002-06-18 | 2002-06-18 | 1 | NI U23 | 800m |