400m U23 Men, Heat:2 of 4 ; Official result
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 5 | 140 | MURPHY Paul | Ferrybank A.C. | 50.29 | Q W/D | |||
| 2 | 6 | 75 | HALWAX Joe | Dundrum South Dublin A.C. | 50.59 | q | |||
| 3 | 4 | 182 | MURPHY Adam | St. L. O'Toole A.C. | 51.02 | ||||
| 4 | 2 | 25 | MARCUS Dion | An Riocht A.C. | 51.47 | ||||
| 5 | 3 | 207 | SCULLY Owen | St. L. O'Toole A.C. | 51.83 |