400m U23 Men, Heat:2 of 3 ; Official result since 12:48
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 145 | ARREY Brandon | Blarney/Inniscara A.C. | 49.37 | Q | |||
| 2 | 2 | 55 | NEWELL Craig | Ballymena & Antrim A.C. | 49.43 | q | |||
| 3 | 4 | 169 | DEE Ciaran | Leevale A.C. | 51.35 | ||||
| 4 | 6 | 368 | ST. CLARE JOHNSON Chris | Enniscorthy Juvenile A.C. | 51.83 | ||||
| 5 | 5 | 313 | GRIFFIN Henry | Galway City Harriers A.C. | 55.70 |