| - | 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 |
|---|---|---|---|---|---|---|
| Stephen ? | m | 2005-02-05 | 2005-02-05 | 1 | Unknown | XC |
| M. Ó Ceallaigh | m | 1961-05-14 | 1961-05-14 | 1 | NACA | DT |
| Andrew Ó Donnghaile | m | 2016-03-05 | 2017-03-04 | 7 | NUIG | 3000m, 3000mSC, 5000m, Road, XC |
| Risteard Ó Hannracháín | m | 2009-11-14 | 2011-03-12 | 3 | TCD | Road, XC |
| S. Ó Laithimh | m | 1934-05-26 | 1934-05-26 | 3 | UCG | 440y, 880y, Mile |
| Aogán Ó Muircheartaigh | m | 1967-05-05 | 1968-05-01 | 10 | UCD | 100y, 120yH, 220y, 4x110y |
| Colm A. Ó Muircheartaigh | m | 1965-05-08 | 1966-05-18 | 10 | IUAA, UCD | 220y, 440y, 440yH, 4x110y |
| Iognáid G. "Iggy" Ó Muircheartaigh | m | 1961-06-01 | 1967-05-27 | 34 | BLE, IUAA, NACA, UCD | 100y, 220y, 440y, 4x110y |
| Seán F. Ó Muircheartaigh | m | 1964-05-20 | 1969-07-12 | 41 | IUAA, UCD | 120yH, 440y, 440yH, 4x110y, LJ, TJ |
| Breandán Ó Riain | m | 2012-04-20 | 2012-04-21 | 2 | UCD | HJ, LJ |
| Micheal Ó'Conaire | m | 1998-12-11 | 1998-12-12 | 1 | NUIG | 60m |
| Micheal Ó'Connaire | m | 1998-12-11 | 1998-12-12 | 1 | NUIG | SP |
| Diarmuid Ó'Séaghdha | m | 2000-02-05 | 2004-02-28 | 13 | TCD | 10000m, 5000m, Road, XC |
| Daithí Ó'Shionaigh | m | 2017-04-07 | 2017-04-08 | 2 | UCC | 1500m |
| Eimear ? | f | 2005-02-05 | 2005-02-05 | 1 | UCD | XC |
| Bebhinn Ó Meadhra | f | 1970-03-14 | 1970-03-14 | 1 | TCD | XC |
| Laoise Ó Murchú | f | 1994-01-21 | 1994-04-23 | 4 | UCD | 400m, 400mH |
| Margaret ÓhÓgartaigh | f | 1994-02-19 | 1998-04-25 | 14 | Guest, UCD | 10000m, 1500mW, 3000m, 400mH, 800m, PV, SP, XC |