800m U18 Men, Heat:1 of 2 ; Official result since 14:26
CBP 1:53.18 Harry Purcell
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 10 | 413 | GILES Craig | Clonliffe Harriers A.C. | 2:01.01 | Q | |||
| 2 | 9 | 161 | KELLY Cian | St Abbans A.C | 2:01.09 | Q | |||
| 3 | 5 | 750 | RYAN Conor | Templemore A.C. | 2:01.13 | Q | |||
| 4 | 3 | 866 | MCHUGH Conor | Mullingar Harriers A.C. | 2:01.27 | q | |||
| 5 | 2 | 978 | NOLAN, James | Drogheda & Dist A.C. | U18 | 2:01.91 | q | ||
| 6 | 7 | 586 | MCSTAY Thomas | Galway City Harriers A.C. | 2:02.13 | ||||
| 7 | 4 | 585 | LYONS Oisin | Craughwell A.C. | 2:03.17 | ||||
| 8 | 1 | 416 | MOYNIHAN O'BRADAIGH Naoise | Dundrum South Dublin A.C. | 2:03.22 | ||||
| 9 | 8 | 751 | MOLONEY Kieran | Thurles Crokes A.C. | 2:05.26 | ||||
| 10 | 6 | 871 | TEREK Sean | City of Lisburn AC | 2:05.74 |