| - | 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 |
|---|---|---|---|---|---|---|
| J.J. Igoe | m | 1936-05-30 | 1936-05-30 | 2 | UCG | DT, SP |
| Yujiro Iida | m | 2009-03-28 | 2009-03-28 | 1 | SU | XC |
| Todd Imwold | m | 1995-06-20 | 1995-06-20 | 1 | H & Y | 200m |
| Donal Iremonger | m | 1991-03-02 | 1992-03-07 | 2 | DCU, UCD | XC |
| David Irwin | m | 1996-06-25 | 1996-06-25 | 1 | NI U23 | SP |
| T.R. Irwin | m | 1920-06-05 | 1920-06-05 | 2 | QUB | 100y, 440y |
| A. Ivers | m | 1964-05-31 | 1964-05-31 | 1 | NACA | Mile |
| Breffni Ingerton | f | 1992-03-07 | 1992-04-25 | 2 | UCC | 800m, XC |
| Brefní Ingerton | f | 1991-03-02 | 1991-03-02 | 1 | UCC | XC |
| Claire Ingerton | f | 1993-04-23 | 1993-06-22 | 3 | IUAA, UCD | 200m, LJ |
| Miriam Ingerton | f | 1988-04-29 | 1990-03-03 | 4 | TCE | 400m, 400mH, XC |
| Jill Ippolito | f | 1995-06-17 | 1995-06-20 | 2 | H & Y | LJ |
| Katherine Irvine | f | 2008-04-18 | 2009-11-14 | 3 | UCC | 3000m, 5000m, Road |
| Zahran Itilli | f | 2000-04-14 | 2000-04-15 | 1 | RCSI | 100m |