400m Jun Women, Heat:1 of 3 ; Official result
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 4 | 172 | DALY Miriam | Carrick-on-Suir A.C. | 57.00 | Q | |||
| 2 | 5 | 52 | MURRAY Deirdre | Na Fianna A.C. | 57.61 | q | |||
| 3 | 6 | 23 | HOURIHAN Molly | Dundrum South Dublin A.C. | 59.36 | q | |||
| 4 | 2 | 339 | SHEEHY Aoife | Galway City Harriers A.C. | 60.20 | q | |||
| 5 | 3 | 244 | GONSALVES Olivia | Trim A.C. | 67.24 |