400m Jun Men, Heat:3 of 4 ; Official result
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 5 | 85 | MITCHELL Jamie | Emerald A.C. | 51.52 | Q | |||
| 2 | 4 | 132 | ADEKOYA Christopher | St. L. O'Toole A.C. | 52.08 | ||||
| 3 | 6 | 400 | BRULE Diego | Galway City Harriers A.C. | 52.60 | ||||
| 4 | 3 | 193 | MCNELIS Ryan | Athenry A.C. | 52.95 | ||||
| 5 | 2 | 209 | DELANEY Samuel | St. Pauls A.C. | 55.46 |