400m U18 Men, Heat:2 of 3 ; Official result since 10:42
49.59 John Fitzsimons
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 2 | 300 | O'ROURKE Cormac | Lagan Valley AC | 51.67 | Q | |||
| 2 | 4 | 331 | JONES Ben | Dundrum South Dublin A.C. | 52.23 | q | |||
| 3 | 6 | 338 | DUNNE James | Tullamore Harriers A.C. | 53.12 | q | |||
| 4 | 3 | 334 | HANRAHAN Conor | Brothers Pearse A.C. | 53.88 | ||||
| 5 | 5 | 341 | HOWARD Fintan | Naas A.C. | 55.11 |