400m U17 Men, Heat:1 of 2 ; Official result since 11:55
CBP 49.66 Joseph Dowling
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 368 | O'LEARY Ryan | Leevale A.C. | 53.30 | Q | |||
| 2 | 7 | 564 | MCMANUS Ciarán | Fingallians A.C. | 53.74 | Q | |||
| 3 | 4 | 565 | JONES Ben | Dundrum South Dublin A.C. | 54.29 | Q | |||
| 4 | 2 | 710 | COMMINS Jonathan | Ardee & District A.C. | 56.80 | ||||
| 5 | 6 | 631 | MACGABHANN Rory | Kilkenny City Harriers A.C. | 57.55 | ||||
| 6 | 5 | 713 | REILLY Finn | Dunleer A.C. | 1:00.10 | ||||
| 7 | 8 | 952 | DUNBAR GIBNEY Ben | St. L. O'Toole A.C. | 1:00.89 |