| - | 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 |
|---|---|---|---|---|---|---|
| Anthony J. "Tony" Taaffe | m | 1963-05-22 | 1967-06-01 | 7 | UCD | 440y, 880y |
| Brendan Taffe | m | 1996-12-13 | 1998-04-25 | 14 | UCD | 4x200m, 4x400m, 800m, CE, HJ, JT, LJ, PV, TJ |
| T. Taffee | m | 1964-05-09 | 1964-05-09 | 1 | UCD | 880y |
| Eoin Taggart | m | 2014-11-15 | 2019-04-06 | 16 | UCD | 10000m, 3000m, 4x400m, 5000m, Road, XC |
| Simon Taggart | m | 2005-11-19 | 2013-06-01 | 50 | GST, TCD | 110mH, 200m, 3000mW, 400m, 4x100m, 4x200m, 4x400m, 60m, 60mH, CE, HJ, JT, LJ, Road, SP |
| Kashif Taiyebi | m | 2018-04-13 | 2022-01-29 | 5 | QUB | 200m, 4x100m, 4x200m, 60m |
| Miika Takala | m | 2002-11-16 | 2002-11-16 | 1 | QUB | Road |
| Gab Takoodjou | m | 2012-11-17 | 2013-03-09 | 2 | AIT | Road, XC |
| Laurent Tala | m | 2013-11-23 | 2015-02-06 | 9 | ITB | 200m, 4x100m, 4x200m, Road |
| Majestic Tam | m | 2004-04-16 | 2004-04-17 | 2 | RCSI | DT, SP |
| Radu Tampu | m | 2019-02-08 | 2019-02-08 | 1 | DCU | TJ |
| James Tanner | m | 2023-11-10 | 2024-04-06 | 6 | TUS | 3000m, 5000m, Road, XC |
| S. Tanner | m | 1977-03-12 | 1977-03-12 | 1 | QUB | XC |
| Aaron Tansey | m | 2022-01-29 | 2022-04-09 | 3 | IT Carlow | 3000m, 5000m |
| Aaron Tansey | m | 2023-11-10 | 2024-02-10 | 2 | SETU | 800m, Road |
| Fergal Tansey | m | 1989-05-05 | 2006-04-22 | 15 | GST, UCD | 2000mW, 3000mW, 5000m, XC |
| John "Jack" Tansey | m | 1967-11-25 | 1967-11-25 | 1 | UCD | XC |
| Paul J.A. Tansey | m | 1968-11-30 | 1968-11-30 | 1 | TCD | XC |
| Paul Tanson | m | 1999-06-22 | 1999-06-22 | 1 | SU | 1500m |
| Michael Tarnewsky | m | 2017-05-27 | 2019-05-25 | 3 | Scotland, SUCA | TJ |
| Christopher Tate | m | 2018-04-13 | 2018-04-14 | 1 | QUB | SP |
| James Taykor | m | 2004-11-20 | 2004-11-20 | 1 | TCD | Road |
| Clifford J. "Cliff" Taylor | m | 1981-03-07 | 1983-03-12 | 3 | TCD | XC |
| James Taylor | m | 2003-11-22 | 2005-11-19 | 2 | TCD | Road |
| Oisin Taylor | m | 2013-02-01 | 2017-04-08 | 14 | DCU, IUAA | LJ, TJ |
| Simon Taylor | m | 2002-03-09 | 2006-04-22 | 24 | IUAA, NI U23, QUB | 10000m, 1500m, 3000m, 3000mW, 4x400m, 5000m, Road, XC |
| Stephan Teeling-Lynch | m | 2007-02-24 | 2007-02-24 | 1 | IT Sligo | XC |
| Matthew Teggart | m | 2012-07-18 | 2012-07-18 | 1 | Ballymena & Antrim AC | 100m |
| Patrick Temple | m | 2005-02-05 | 2006-04-22 | 8 | TCD | 3000m, 3000mSC, Road, XC |
| Kyle Tenkrooden | m | 2020-02-15 | 2020-02-15 | 3 | IT Tralee | 200m, 35lbWfD, 60m |
| Peter Terek | m | 2021-11-13 | 2024-04-06 | 11 | QUB | 400m, 4x1000m, 4x200m, 800m, Mixed 4x400m, Road |
| Sean Terek | m | 2018-11-17 | 2023-01-28 | 16 | QUB | 4x1000m, 4x400m, 800m, Road, XC |
| Antoine Thalmann | m | 2011-11-12 | 2011-11-12 | 1 | UCD | Road |
| Geoff Theisson | m | 2001-06-19 | 2001-06-19 | 2 | GST, SU | LJ, TJ |
| Damien Thillaye Du Boullay | m | 2004-11-20 | 2006-04-22 | 8 | IUAA, QUB | 1500m, Road, XC |
| Ben Thistlewood | m | 2012-11-17 | 2016-03-05 | 17 | IUAA, UCC | 1500m, 3000m, 5000m, Road, XC |
| Jax Thoirs | m | 2018-05-26 | 2018-05-26 | 1 | Scotland | LJ |
| Howard Thom | m | 2004-01-24 | 2004-01-24 | 1 | TCD | XC |
| Jirka Thoma | m | 2011-04-29 | 2012-11-17 | 2 | CIT | 3000mSC, Road |
| Juri Thoma | m | 2012-03-10 | 2012-04-21 | 2 | CIT | 3000mW, XC |
| Adam Thomas | m | 2014-05-31 | 2014-05-31 | 2 | SAL Select | 100m, 4x100m |
| Alec Thomas | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | 100m |
| Barry Thomas | m | 1995-03-11 | 1995-03-11 | 4 | Birmingham | 60m, HJ, LJ, SP |
| H. Thomas | m | 1960-05-15 | 1960-05-15 | 1 | NACA | 880y |
| Jorge Thomas | m | 2009-03-28 | 2009-03-28 | 1 | Wales | XC |
| Kade Thomas | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | 100m |
| Laurent Thomas | m | 2005-11-19 | 2006-03-04 | 2 | TCD | Road, XC |
| R. Thomas | m | 1982-03-06 | 1982-03-06 | 1 | QUB | XC |
| F.W. Thompson | m | 1873-05-19 | 1873-05-19 | 1 | QUB | 4Mile W |
| Gareth Thompson | m | 2016-02-12 | 2019-04-06 | 30 | QUB | 100m, 200m, 4x100m, 4x200m, 4x400m |
| J. Thompson | m | 1966-02-19 | 1966-02-19 | 1 | UCD | XC |
| John Thompson | m | 1996-12-13 | 2001-04-21 | 15 | IUAA, RCSI, TCD | 35lbWfD, DT, HT, JT, SP |
| John K.S. Thompson | m | 1922-06-10 | 1924-05-31 | 3 | TCD | DT |
| Mark Thompson | m | 1999-06-22 | 2005-06-07 | 34 | GST, IUAA, NI U23, QUB | 35lbWfD, DT, HT, JT, SP |
| Oisin Thompson | m | 2024-02-10 | 2024-04-06 | 2 | ATU | LJ |
| P. Thompson | m | 1993-06-22 | 1994-06-28 | 2 | NI U20 | HT |
| Sean Thompson | m | 2013-06-01 | 2013-06-01 | 3 | SU | 100m, 200m, 4x100m |
| Sean Thompson | m | 2018-02-09 | 2018-05-26 | 5 | Ireland, TCD | 200m, 4x100m, TJ |
| Sean Thompson | m | 2019-02-08 | 2020-02-15 | 6 | TCD | 200m, 4x100m, TJ |
| Sean Thompson | m | 2022-01-29 | 2022-04-09 | 2 | TCD | TJ |
| Stephen Thompson | m | 2001-04-20 | 2001-04-21 | 1 | RCSI | HT |
| Steven Thompson | m | 2002-06-18 | 2003-06-10 | 2 | GST, NI U23 | 100m, 200m |
| Talon Thompson | m | 2017-11-18 | 2018-05-26 | 6 | Ireland, UG | 3000m, 3000mSC, Road, XC |
| Thomas Thompson | m | 1995-03-04 | 1995-03-04 | 1 | DCU | XC |
| Walter John Thompson | m | 1937-05-22 | 1937-05-22 | 2 | TCD | 120yH |
| Alex Thomson | m | 2017-05-27 | 2017-05-27 | 3 | SUCA | 100m, 200m, 4x100m |
| Conor Thomson | m | 2017-05-27 | 2017-05-27 | 1 | SUCA | 3000mSC |
| Dylan Thomson | m | 2019-05-25 | 2019-05-25 | 1 | Scotland | PV |
| Fearghus Thomson | m | 2017-05-27 | 2017-05-27 | 1 | SUCA | 3000mSC |
| Ryan Thomson | m | 2015-05-31 | 2015-05-31 | 1 | SUCA | 5000m |
| Stewart Thomson | m | 2022-11-11 | 2022-11-11 | 1 | QUB | Road |
| Jason Thong | m | 2009-02-14 | 2009-02-15 | 2 | IT Tralee | 200m, 60m |
| T. Thornhill | m | 1983-05-06 | 1983-05-07 | 1 | UCD | HT |
| Alan Thornton | m | 2000-02-26 | 2000-02-26 | 1 | UG | XC |
| C. Thornton | m | 1978-03-04 | 1978-03-04 | 1 | UCC | XC |
| D. Thornton | m | 1995-03-11 | 1995-03-11 | 1 | Loughborough | 800m |
| Eddie Thornton | m | 1959-05-13 | 1965-06-23 | 31 | AAUE, IUAA, UCD | 100y, 120yH, 220y, 440yH, 4x100y, 4x110y |
| Gary Thornton | m | 1998-02-28 | 2003-04-26 | 13 | IUAA, UG | 10000m, 1500m, Road, XC |
| J.R. Thornton | m | 1939-05-27 | 1939-05-27 | 2 | UCD | 100y, 220y |
| Philip Thornton | m | 2022-04-08 | 2022-04-09 | 1 | DCU | HT |
| Shane Thornton | m | 2000-12-01 | 2004-02-07 | 10 | IUAA, UCC | 4x100m, 4x200m, LJ |
| George Thunecke | m | 1966-05-18 | 1967-06-01 | 3 | TCD | JTo |
| C. Thurley | m | 1976-03-06 | 1978-05-06 | 2 | UCD | 400mH, XC |
| B. Tiernan | m | 1960-05-15 | 1961-05-14 | 2 | NACA | LJ |
| Peter Tiernan | m | 1998-02-28 | 1998-02-28 | 1 | UL | XC |
| Cillian Tierney | m | 2020-03-07 | 2020-03-07 | 1 | UL | XC |
| David Tierney | m | 2009-04-24 | 2013-06-01 | 25 | IUAA, UCC, UCD | 100m, 35lbWfD, DT, HT, JT, SP |
| John Tierney | m | 1999-11-13 | 2002-04-19 | 6 | NUIM | 1500m, 5000m, CE, Road, XC |
| P. Tierney | m | 1928-06-02 | 1928-06-02 | 1 | UCC | Mile |
| P.J. Tierney | m | 1929-06-01 | 1929-06-01 | 2 | UCC | 880y, Mile |
| Aaron Tierney Smith | m | 2019-02-08 | 2022-04-09 | 13 | WIT | 110mH, 400m, 4x100m, 4x200m, 60m, 60mH |
| Conner Tiernuy | m | 2010-03-13 | 2010-03-13 | 1 | CIT | XC |
| John Tilburt | m | 1995-06-17 | 1995-06-20 | 2 | H & Y | HJ |
| John Tillson | m | 2013-11-23 | 2013-11-23 | 1 | DCU | Road |
| David N.F. Tilsley | m | 1972-05-05 | 1975-05-21 | 20 | TCD | 110mH, 200m, 400mH, 4x100m, HJ, TJ |
| P. Timlin | m | 1982-03-06 | 1982-03-06 | 1 | UCG | XC |
| Peter Timlin | m | 1988-03-05 | 1988-03-05 | 1 | UCG | XC |
| Nicholas Henry Joseph Tindal | m | 1931-05-30 | 1931-05-30 | 1 | TCD | LJ |
| Cameron Tindle | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | 200m |
| Ronan Tinsley | m | 2003-03-09 | 2003-03-09 | 1 | CIT | XC |
| William Stewart Tinsley | m | 1912-06-03 | 1912-06-03 | 2 | UCC | 100y, 220y |
| W. Tips | m | 1971-05-22 | 1971-05-22 | 1 | Louvain | 400m |
| Drew Tivendale | m | 1995-06-20 | 1995-06-20 | 1 | SU | 5000m |
| Ian Tivy | m | 2005-11-19 | 2008-03-08 | 17 | CIT | 1500m, 400m, 4x400m, 800m, HJ, Road, XC |
| Denis Tkatchenko | m | 2002-02-16 | 2007-04-14 | 23 | TCD | 100m, 2000mW, 3000mW, 400m, 60m, Road, XC |
| Matthew Toal | m | 2012-07-18 | 2012-07-18 | 1 | Lagan Valley AC | 100m |
| Daniel Tobin | m | 2003-04-25 | 2005-04-23 | 15 | DCU, IUAA | 200m, 400m, 4x400m |
| David Tobin | m | 2010-02-13 | 2013-02-01 | 4 | WIT | 60m, HJ, LJ |
| David Tobin | m | 2014-04-11 | 2015-02-06 | 2 | UU | LJ |
| Ian Tobin | m | 2012-11-17 | 2013-03-09 | 2 | CIT | Road, XC |
| J. Tobin | m | 1979-03-17 | 1982-03-06 | 4 | UCC | XC |
| Robert Tobin | m | 2007-04-13 | 2007-04-14 | 1 | UCD | 110mH |
| Donald Todd | m | 2013-06-01 | 2014-05-31 | 4 | SU, SUCA | 100m, 4x100m, TJ |
| B. Togher | m | 1946-07-14 | 1946-07-14 | 1 | UCG | Mile |
| Paul Togher | m | 2008-03-08 | 2008-03-08 | 1 | GST | XC |
| Paul Tohill | m | 1998-06-23 | 2001-06-19 | 5 | NI U23 | 110mH, HJ |
| Tunde Toki | m | 2013-02-01 | 2014-02-07 | 2 | DKIT | 60m |
| Eddie Toner | m | 1995-06-20 | 1995-06-20 | 1 | SU | 3000mSC |
| Ivan Toner | m | 1998-02-28 | 1999-03-06 | 2 | QUB | XC |
| James Toner | m | 1998-03-14 | 1999-06-22 | 2 | SU | 800m, XC |
| John Toner | m | 2001-04-20 | 2001-12-08 | 8 | UG | 100m, 200m, 4x200m, 60m, TJ |
| P. Tonge | m | 1964-05-30 | 1964-05-30 | 1 | AAUE | 880y |
| Shaun Tonner | m | 2013-06-01 | 2013-06-01 | 3 | SU | 100m, 200m, 4x100m |
| Shaun Tonner | m | 2015-05-31 | 2015-05-31 | 1 | GST | 100m |
| Shaun Tonner | m | 2015-05-31 | 2016-05-28 | 5 | SUCA | 100m, 200m, 4x100m |
| Gregor Toohey | m | 2004-12-03 | 2009-04-25 | 9 | UG, UL | 4x100m, 4x200m, 60m, DT, JT, PV |
| Adrian Toolan | m | 2006-12-02 | 2009-02-15 | 11 | UCD | 400m, 4x100m, 4x200m, 4x400m, 800m, Road |
| David Toolan | m | 1994-01-21 | 1994-01-21 | 2 | UCG | 3000m, 400m |
| Humphreys Toomey | m | 1997-02-01 | 1999-11-13 | 4 | DIT | Road, XC |
| John Toomey | m | 2003-11-22 | 2003-11-22 | 1 | UCD | Road |
| John Toomey | m | 1968-05-01 | 1970-05-13 | 13 | IUAA, UCD | 120yH, 400m, 400mH, 440y, 440yH, XC |
| Paul Mary Toomey | m | 1961-06-01 | 1963-05-22 | 4 | TCD | 440y, 880y |
| B. Tormey | m | 1971-12-11 | 1973-03-10 | 2 | UCD | XC |
| Peter Tormey | m | 2012-03-10 | 2012-03-10 | 1 | RCSI | XC |
| D. Torrens | m | 1974-05-03 | 1975-03-08 | 2 | QUB | 3000mSC, XC |
| Eoghan Totten | m | 2012-07-18 | 2012-07-18 | 1 | Newcastle & District AC | 3000m |
| Paul Towell | m | 1972-03-04 | 1975-05-21 | 9 | UCD | 400m, 800m, XC |
| Stephen Towers | m | 2006-12-02 | 2007-04-14 | 8 | QUB | 100m, 35lbWfD, 4x200m, 60m, DT, LJ, SP |
| Liam Townsend | m | 2010-04-07 | 2010-04-24 | 8 | TCD | 100m, 200m, 4x100m, 4x400m, LJ |
| Sean Townsend | m | 2018-04-13 | 2019-11-16 | 5 | UCD | 4x400m, Road |
| G. Townsley | m | 1929-06-01 | 1929-06-01 | 2 | QUB | 100y, 440y |
| Oisin Toye | m | 2023-11-10 | 2024-04-06 | 5 | ATU | 1500m, Road |
| Pietro Tozzi | m | 2019-02-08 | 2020-02-15 | 7 | UCC | 4x100m, LJ, TJ |
| John Tracey | m | 1992-03-07 | 2003-03-22 | 15 | GST, IUAA, NI U23, QUB, UU | 10000m, 3000m, 5000m, Road, XC |
| John Tracey | m | 1977-06-14 | 1977-06-14 | 1 | Ireland | 3000m |
| Michael Gerard Tracey | m | 1976-03-06 | 1976-03-06 | 1 | TCD | XC |
| Chris Tracy | m | 2002-11-16 | 2003-03-09 | 5 | DIT | 1500m, 800m, Road, XC |
| P. Trainer | m | 1995-03-11 | 1995-03-11 | 1 | Loughborough | SP |
| J.P. Trainor | m | 1935-05-25 | 1937-05-22 | 5 | UCD | 220y, 440y |
| P. Trammel | m | 1977-06-14 | 1977-06-14 | 1 | Birmingham | PV |
| Raymond Joseph "Ray" Trautman | m | 1977-05-06 | 1980-05-03 | 9 | TCD | DT, SP |
| Ian Cyril Travers | m | 1973-05-11 | 1976-05-11 | 9 | TCD | 110mH, HJ |
| John Travers | m | 2012-11-17 | 2015-04-11 | 16 | AIT | 10000m, 1500m, 4x400m, 5000m, Road, XC |
| Max Travers | m | 2014-11-15 | 2017-11-18 | 12 | QUB | 1500m, Road, XC |
| Mervin Travers | m | 2004-12-03 | 2004-12-04 | 2 | UCD | 35lbWfD, SP |
| B. Traynor | m | 1973-03-10 | 1974-05-04 | 2 | SPM | 3000mSC, XC |
| Luke Traynor | m | 2014-05-31 | 2014-05-31 | 1 | SAL Select | 5000m |
| Sean Gabrial Traynor | m | 1968-05-01 | 1969-05-03 | 2 | TCD | HJ |
| Chris Treacey | m | 2003-11-22 | 2004-11-20 | 2 | DIT | Road |
| Bobby Treacy | m | 2017-02-10 | 2017-02-10 | 4 | UCD | 60mH, CE, LJ, SP |
| Brian Treacy | m | 1992-01-31 | 1995-12-16 | 4 | QUB | 1500m, XC |
| Ciar n Treacy | m | 2015-04-10 | 2015-04-11 | 1 | MU | 200m |
| Cormac Treacy | m | 2009-11-14 | 2010-04-24 | 5 | DIT | 200m, 4x400m, 60m, Road |
| Daniel Treacy | m | 2006-11-18 | 2008-11-15 | 9 | DCU | 1500m, 400mH, 800m, Road, XC |
| John Treacy | m | 1994-04-22 | 1996-04-20 | 4 | QUB | 10000m, 3000m |
| Pat Treacy | m | 1995-12-16 | 1995-12-16 | 1 | TCD | XC |
| Ray Treacy | m | 1977-06-14 | 1977-06-14 | 1 | BLE Select | 5000m |
| Richard "Rick" Treacy | m | 1994-06-28 | 1999-06-22 | 4 | IUAA, NI U20, QUB | HJ, TJ |
| Tiernan Treacy | m | 2015-04-10 | 2015-04-11 | 2 | QUB | 100m, 200m |
| James Treanor | m | 2012-02-04 | 2016-03-05 | 6 | DCU | 2000mW, Road, XC |
| James Tremayne | m | 2012-11-17 | 2013-03-09 | 2 | RCSI | Road, XC |
| B. Tremble | m | 1975-05-02 | 1975-05-03 | 1 | UCD | 3000mSC |
| Brian Tremble | m | 1975-03-08 | 1981-05-13 | 15 | UCD | 1500m, 400mH, 800m, XC |
| Liam Tremble | m | 2010-03-13 | 2016-11-19 | 28 | IUAA, TCD | 1000m, 1500m, 3000m, 4x400m, 5000m, 800m, Mile, Road, XC |
| S. Tremier | m | 1976-04-30 | 1976-05-01 | 1 | QUB | PV |
| Alan Triggs | m | 1991-03-02 | 1991-03-02 | 1 | Cork RTC | XC |
| Ivan Trimble | m | 1991-03-02 | 1993-03-06 | 2 | UU | XC |
| David Troy | m | 2019-11-16 | 2022-04-09 | 3 | UCD | 10000m, Road, XC |
| Kelvin Tsang | m | 2018-02-09 | 2018-02-09 | 1 | AIT | TJ |
| Richard Tsang | m | 2010-02-13 | 2014-04-12 | 19 | UU | 35lbWfD, 4x100m, 4x200m, DT, LJ, PV, TJ |
| Richard Tsang | m | 2015-05-31 | 2017-05-27 | 3 | SUCA | LJ, TJ |
| Thabo Tsiki | m | 2015-03-07 | 2015-03-07 | 1 | IT Tralee | XC |
| Fergal Tubridy | m | 1994-02-19 | 1999-11-13 | 14 | CIT, Cork RTC | 4x400m, 800m, Road, XC |
| Conor Tuck | m | 2018-11-17 | 2018-11-17 | 1 | DCU | Road |
| J. Tucker | m | 1990-04-27 | 1990-04-28 | 1 | UCD | JT |
| John W.T. Tuckey | m | 1939-07-01 | 1939-07-01 | 1 | IUAA | Mile |
| Niall Tuckey | m | 1996-04-19 | 1999-04-24 | 2 | DIT | JT |
| Ids Tuinstra | m | 2015-04-10 | 2015-04-11 | 1 | UG | 800m |
| David Tuite | m | 1992-04-24 | 1992-04-25 | 2 | TCD | 35lbWfD, HT |
| Ken Tuite | m | 2009-04-24 | 2009-04-25 | 1 | DIT | 100m |
| James Tully | m | 2010-02-13 | 2010-02-13 | 1 | UG | LJ |
| Gary Tumilty | m | 1997-06-24 | 2000-11-12 | 6 | NI U23, QUB, Queen's Select | 3000mSC, 5000m, Road, XC |
| K. Tummon | m | 1986-03-08 | 1986-03-08 | 1 | TCE | XC |
| M. Tunney | m | 1981-03-07 | 1981-03-07 | 1 | UCG | XC |
| Aodhgán Tuohy | m | 2011-11-12 | 2013-02-01 | 4 | UL | 2000mW, Road, XC |
| Niall Tuohy | m | 2011-04-29 | 2016-11-19 | 15 | UL | 1500m, 4x400m, 800m, PV, Road |
| Jason Turbitt | m | 1996-12-13 | 1996-12-14 | 3 | QUB | 60m, LJ, SP |
| T. Turkington | m | 1971-05-07 | 1972-05-06 | 3 | NUU, UU | LJ, TJ |
| Tetah Turkson | m | 1993-06-22 | 1993-06-22 | 1 | NI U20 | TJ |
| David Turnbull | m | 1998-06-23 | 1998-06-23 | 1 | SU | 200m |
| Gareth Turnbull | m | 1994-06-28 | 1994-06-28 | 1 | GST | 1500m |
| Ian Turnbull | m | 1971-05-22 | 1971-05-22 | 2 | SU | 100m, 200m |
| Martin Harper Turnbull | m | 1913-05-24 | 1914-06-06 | 4 | QUB | 440y, 880y, Mile |
| Adam Turner | m | 2022-01-29 | 2022-04-09 | 4 | CIT | 4x100m, LJ |
| Adam Turner | m | 2023-01-28 | 2024-04-06 | 11 | GST, MTU | 4x100m, 4x200m, LJ |
| Andrew Turner | m | 1998-06-23 | 1998-06-23 | 1 | SU | JT |
| Colm Turner | m | 2004-11-20 | 2008-04-19 | 12 | DCU, IUAA | 3000m, 3000mSC, 5000m, Road, XC |
| Liam Turner | m | 2019-03-02 | 2019-03-02 | 1 | DCU | XC |
| C. Turnley | m | 1975-03-08 | 1975-03-08 | 1 | UCD | XC |
| Simon Turnock | m | 2013-04-12 | 2014-04-12 | 5 | DCU | 35lbWfD, 4x100m |
| Aleric Turtle | m | 1999-04-23 | 1999-04-24 | 1 | QUB | 200m |
| B. Tuttle | m | 1999-04-23 | 1999-04-24 | 1 | UCD | PV |
| G. Tweedie | m | 1976-03-06 | 1976-03-06 | 1 | QUB | XC |
| Philip Tweedie | m | 1989-03-04 | 1990-03-03 | 4 | UU | 800m, XC |
| O. Tweedie-Stodart | m | 1939-07-01 | 1939-07-01 | 1 | Atalanta | Mile |
| Bill Twomey | m | 2010-11-13 | 2012-04-21 | 8 | UCC | 1500m, 4x100m, 5000m, Road, XC |
| Denis Twomey | m | 1959-05-17 | 1967-05-27 | 26 | BLE, IUAA, NACA, UCD | 120yH, JT, JTo, PV |
| Jerry Twomey | m | 1955-05-19 | 1955-05-19 | 1 | UCD | 100y |
| N. Twomey | m | 1965-06-22 | 1965-06-22 | 1 | NACA | TJ |
| Jack Tyas | m | 2016-11-19 | 2017-03-04 | 4 | AIT | 1500m, Road, XC |
| Derek John Tyler | m | 1961-06-01 | 1964-05-20 | 8 | TCD | 120yH, 440yH |
| Matt Tyler | m | 1996-06-25 | 1996-06-25 | 1 | SU | 5000m |
| T. Tynan | m | 1975-05-02 | 1975-05-03 | 2 | NCPE | 400mH, PV |
| Oisin Tyrrell | m | 2011-02-05 | 2011-02-05 | 3 | UCD | 400m, 4x200m |
| Wallace "Wally" Tyrrell | m | 1947-05-21 | 1947-05-21 | 1 | UCD | LJ |
| Erin Taheny | f | 2022-01-29 | 2024-04-06 | 25 | DCU | 100m, 200m, 4x100m, 4x200m, 60m |
| Anna Tait | f | 2016-05-28 | 2016-05-28 | 1 | SUCA | 800m |
| Yuko Takenaka | f | 1995-06-17 | 1995-06-17 | 2 | H & Y, Yale | 100mH, 400mH |
| Aoife Talty | f | 2003-11-22 | 2005-02-26 | 4 | TCD | Road, XC |
| Cliodhna Talty | f | 1997-02-01 | 1999-03-06 | 3 | UCG, UG | XC |
| Jia Min Tan | f | 2022-03-05 | 2022-03-05 | 1 | LYIT | XC |
| Sarah Taplin | f | 1998-03-14 | 1998-03-14 | 1 | SU | XC |
| Abbey Tate | f | 2023-01-28 | 2024-04-06 | 6 | QUB | 4x100m, LJ |
| Claire Taylor | f | 2013-06-01 | 2014-05-31 | 7 | SU, SUCA | 100m, 100mH, 400mH, 4x100m, 4x400m |
| Trudy Taylor | f | 1995-06-17 | 1995-06-20 | 3 | GST, H & Y, Yale | DT, HT |
| Abigail Taylor Freeme | f | 2020-02-15 | 2020-02-15 | 1 | IT Tralee | SP |
| Eilis Teahan | f | 1999-11-13 | 2000-02-26 | 2 | UCC | Road, XC |
| Karina Teahan | f | 1998-12-11 | 2003-04-26 | 15 | President's Select, UCD | 1500m, 3000m, 5000m, Road, XC |
| Niamh Tebay | f | 2011-11-12 | 2016-04-16 | 10 | WIT | 1500m, Road, XC |
| Nadia Termannini | f | 1998-12-11 | 1998-12-12 | 2 | TCD | 1500mW, 3000m |
| Zofia Terzyk | f | 2021-11-13 | 2024-04-06 | 9 | MU | 1500mW, 400mH, 4x100m, 4x200m, Mixed 4x400m, Road |
| Linda Teskey | f | 1969-05-03 | 1971-05-22 | 7 | IUAA, QUB | 100y, 200m, 220y, 400m, 440y, 4x110y, XC |
| Judith Thelen | f | 2002-12-06 | 2002-12-07 | 2 | IT Tralee | 200m, 60m |
| Samantha Thien | f | 2012-02-04 | 2012-02-04 | 1 | RCSI | 60m |
| Brenda Thompson | f | 1995-04-21 | 1996-06-25 | 10 | IUAA, TCD | DT, HT, SP |
| Emma Thompson | f | 2019-05-25 | 2019-05-25 | 2 | Scotland | HJ, JT |
| Fiona Thompson | f | 2007-03-31 | 2008-03-28 | 2 | SU | XC |
| Fiona Thompson | f | 2013-06-01 | 2013-06-01 | 1 | SU | 3000m |
| Gemma Thompson | f | 2001-06-19 | 2004-12-04 | 12 | NI U23, UU | 100m, 200m, 4x200m, 60m |
| Gemma Thompson | f | 2024-02-10 | 2024-02-10 | 3 | QUB | 4x200m, 60m |
| Jennifer Thompson | f | 1994-04-22 | 1994-04-23 | 1 | UCC | 1500mW |
| Aoife Thornton | f | 2012-11-17 | 2012-11-17 | 1 | UG | Road |
| Claire Thornton | f | 2017-04-07 | 2017-04-08 | 1 | UCC | 100m |
| Kealey Tideswell | f | 2004-12-03 | 2004-12-04 | 1 | RCSI | 1500m |
| Caoimhe Tiernan | f | 2014-02-07 | 2015-04-11 | 5 | UL | 100m, 200m, 4x200m, 60m |
| Alexandra Tierney | f | 2019-02-08 | 2019-02-08 | 4 | UCD | CE, HJ, LJ, SP |
| Ally Tierney | f | 2022-01-29 | 2022-01-29 | 4 | UCD | CE, HJ, LJ, SP |
| Theresa Tierney | f | 2004-12-03 | 2004-12-04 | 2 | DKIT | 3000m, 4x200m |
| Elizabeth Tighe | f | 2024-02-10 | 2024-02-10 | 4 | UG | 4x200m, 60mH |
| Pilli-Riin Tikan | f | 2013-02-01 | 2013-02-01 | 1 | IT Carlow | 3000m |
| Orla Timmins | f | 2008-03-08 | 2010-03-13 | 4 | TCD | LJ, Road, XC |
| Nicola Timmons | f | 1993-02-12 | 1994-01-21 | 4 | DCU, IUAA | 400m |
| Lauren Tinkler | f | 2017-11-18 | 2020-03-07 | 8 | DCU | 3000m, 800m, Road, XC |
| Fiona Tinman | f | 1987-05-08 | 1991-05-04 | 8 | QUB | 100m, 200m, 4x100m |
| H. Tinto | f | 1991-05-03 | 1991-05-04 | 1 | UU | JTo |
| Nienke Tjoelker | f | 2008-04-18 | 2008-11-15 | 2 | UCC | 100m, Road |
| Chloe Tobin | f | 2019-02-08 | 2020-02-15 | 7 | UL | 200m, 4x200m, 60m |
| Debbie Tobin | f | 1985-05-03 | 1986-05-03 | 4 | TCE | JTo, SP |
| Keelin Tobin | f | 2011-11-12 | 2012-03-10 | 2 | UCC | Road, XC |
| Triona Tobin | f | 1999-04-23 | 1999-04-24 | 1 | IT Tralee | JT |
| Sarah Tobin Reihill | f | 2016-11-19 | 2018-04-14 | 9 | TCD | 4x100m, 4x400m, 800m, DT, LJ, Road, XC |
| Saoirse Tobin-Reihill | f | 2018-02-09 | 2018-04-14 | 4 | TCD | 4x100m, DT, JT, SP |
| Hannah Todd | f | 2011-04-29 | 2011-04-30 | 2 | QUB | LJ, TJ |
| F. Tohill | f | 1978-03-04 | 1978-03-04 | 1 | NUU | XC |
| Monica Tomassoni | f | 1991-05-03 | 1991-05-04 | 2 | UCC | DT, SP |
| Jen Tomlinson (Jane Eyre) | f | 1994-02-19 | 1994-04-23 | 2 | UCC | 10000m, XC |
| K. Tonge | f | 1976-03-06 | 1977-03-12 | 4 | NCPE | 400m, LJ, XC |
| Anne Marie Torsney | f | 2016-02-12 | 2019-05-25 | 8 | DCU, Ireland | DT, SP |
| Anne Marie Torsney | f | 2019-02-08 | 2019-04-06 | 5 | DCU | 20lbWfD, DT, SP |
| Georgina Touhey | f | 2001-11-07 | 2001-12-08 | 3 | NUIM | 1500m, 1500mW, Road |
| Marie Touhy | f | 2015-04-10 | 2016-04-16 | 4 | AIT | 4x100m, 4x200m, 4x400m |
| Orla Touhy | f | 2004-04-16 | 2004-04-17 | 1 | UCC | 5000m |
| Sinead Touhy | f | 2012-02-04 | 2016-04-16 | 17 | AIT, IUAA | 4x100m, 4x200m, HJ, Road |
| Laure Toullier | f | 2021-11-13 | 2022-04-09 | 3 | UCD | 5000m, Road, XC |
| Sandra Elizabeth Townsend | f | 1977-05-06 | 1977-05-17 | 2 | TCD | JT, JTo |
| Christine Townshend | f | 2003-04-25 | 2003-04-26 | 3 | NUIM | 100m, 200m |
| D. Tracey | f | 1975-05-02 | 1975-05-03 | 1 | NCPE | 800m |
| Sara Tracey | f | 2010-04-23 | 2010-04-24 | 2 | GST | 800m |
| Sinéad Tracey | f | 2020-02-15 | 2022-04-09 | 10 | UG | 400m, 4x200m |
| Margaret Trainor | f | 1993-06-22 | 1993-06-22 | 2 | NI U20 | LJ, TJ |
| Barbara Travers | f | 2010-03-13 | 2010-03-13 | 1 | UG | XC |
| Eimear Treacy | f | 2015-05-31 | 2015-05-31 | 2 | IUAA | 400mH, 4x400m |
| Emer Treacy | f | 2014-11-15 | 2017-04-08 | 11 | DCU, IUAA | 800m, Road, XC |
| Fódhla Treacy | f | 2003-11-22 | 2008-04-19 | 35 | IUAA, TCD | 4x200m, 4x400m, 800m, LJ, PV, Road, TJ, XC |
| Olivia Treacy | f | 2002-11-16 | 2003-11-22 | 3 | TCD | Road, XC |
| Sinéad Treacy | f | 2017-02-10 | 2018-05-26 | 9 | Ireland, UG | 200m, 4x100m, 4x200m, 4x400m, LJ |
| Sinéad Treacy | f | 2018-02-09 | 2018-04-14 | 6 | UG | 200m, 4x100m, 4x200m, 4x400m |
| Hannah Trehy | f | 2011-02-05 | 2014-04-12 | 20 | DCU | 100mH, 1500mW, 400m, 400mH, CE, HJ, LJ, SP, TJ |
| Ellen Trenaman | f | 2023-11-10 | 2023-11-10 | 1 | TCD | Road |
| Bryony Treston | f | 2006-11-18 | 2013-04-13 | 33 | IUAA, President's Select, TCD | 12, 4, 8, 16, 1500m, 3000m, 3000mSC, 4x100m, 5000m, 800m, JT, LJ, PV, Road, XC |
| S. Treston | f | 1968-05-01 | 1968-05-11 | 2 | UCD | 880y |
| A. Trimble | f | 1970-05-09 | 1970-05-09 | 3 | QUB | DT, JTo, SP |
| Kathy Truran | f | 1997-04-25 | 1997-04-26 | 4 | UL | DT, HT, JTo, SP |
| A. Tuite | f | 1983-03-12 | 1983-03-12 | 1 | UCD | XC |
| M. Tunney | f | 1981-03-07 | 1981-03-07 | 1 | UCG | XC |
| Gemma Turley | f | 1998-06-23 | 2000-06-20 | 3 | NI U23 | 100mH, 400mH |
| P. Turley | f | 1981-05-01 | 1981-05-02 | 1 | QUB | 400mH |
| Kellie Turtle | f | 1999-03-06 | 1999-03-06 | 1 | QUB | XC |
| Nicola Tuthill | f | 2023-04-21 | 2024-04-06 | 2 | UCD | HT |
| Cliodhna Tutty Bardon | f | 2016-11-19 | 2016-11-19 | 1 | TCD | Road |
| Breffini Twohig | f | 2010-11-13 | 2010-11-13 | 1 | DCU | Road |
| Leah Twomey | f | 2021-11-13 | 2021-11-13 | 1 | UCC | Road |
| Catriona Twomney | f | 2014-02-07 | 2016-04-16 | 22 | TCD | 20lbWfD, 4x200m, 4x400m, CE, HJ, JT, LJ, SP |
| Grainne Tynan | f | 2008-11-15 | 2008-11-15 | 1 | UCC | Road |
| Orla Tyndall | f | 2010-04-23 | 2010-04-24 | 3 | CIT | 4x100m, 4x400m, LJ |
| E. Tyrell | f | 1974-05-03 | 1976-05-01 | 7 | NCPE | 1500m, 3000m, 800m, XC |