400m Jun Women, Heat:1 of 4 ; Official result since 11:57
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 3 | 233 | CROSSAN Arlene | Finn Valley A.C. | 59.46 | Q | |||
| 2 | 2 | 86 | MURRAY Deirdre | Na Fianna A.C. | 59.72 | q | |||
| 3 | 4 | 248 | DOYLE Sara | St. L. O'Toole A.C. | 59.84 | ||||
| 4 | 1 | 84 | O'TOOLE Ellie | Newbridge A.C. | 1:00.45 | ||||
| 5 | 5 | 265 | SHEILS Emily | Crusaders A.C. | 1:01.22 | ||||
| 6 | 6 | 329 | GENZ Anna Lena | Sli Cualann A.C. | 1:01.29 |