Event 421 Mens 100 Metre Butterfly
| Pos | Name | Age | Club | Time | Splits |
|---|
| 1 | Matthew Gardiner | 17 | Leinster-LE | 1:00.24 | 28.62 | 1:00.24 |
| 2 | Sam Rennick | 15 | Connacht-CO | 1:01.05 | 28.05 | 1:01.05 |
| 3 | Aaron Dolan | 19 | North Lan ST | 1:01.30 | 27.90 | 1:01.30 |
| 4 | Aaron Carroll | 16 | Munster-MN | 1:01.32 | 28.03 | 1:01.32 |
| 5 | Samuel Harris | 17 | Royal Wolv | 1:01.65 | 29.18 | 1:01.65 |
| 6 | James Reilly | 18 | South Lanark | 1:01.67 | 28.90 | 1:01.67 |
| 7 | Billy Pettit | 17 | Ellesmere Co | 1:02.00 | 29.17 | 1:02.00 |
| 8 | Brendan Johnson | 20 | Aberdeen Perf | 1:02.04 | 29.31 | 1:02.04 |
| 9 | Oscar Smillie | 16 | Sth Ayrshire | 1:02.10 | 28.53 | 1:02.10 |
| 10 | Douglas Kelly | 15 | Milngavie &B | 1:02.19 | 28.32 | 1:02.19 |
| | | | | | |
| 11 | Owen McBurnie | 15 | Dumfries | 1:02.21 | 28.61 | 1:02.21 |
| 12 | John Houston | 17 | Sth Ayrshire | 1:02.28 | 28.87 | 1:02.28 |
| 13 | Finley Cousins | 15 | Aberdeen Perf | 1:02.39 | 29.14 | 1:02.39 |
| 14 | Josh Williams | 16 | Wycombe Dist-SE | 1:02.49 | 29.56 | 1:02.49 |
| 15 | Scott Birtles | 20 | Dun City Aqu | 1:02.67 | 29.82 | 1:02.67 |
| 16 | Myles Lapsley | 15 | West Lothian | 1:02.97 | 28.96 | 1:02.97 |
| 17 | James Taylor | 15 | Aberdeen | 1:02.98 | 29.78 | 1:02.98 |
| 18 | Ethan Brown | 15 | St Thomas | 1:03.13 | 29.25 | 1:03.13 |
| 19 | Joseph Cassidy | 28 | Tallaght | 1:03.65 | 29.75 | 1:03.65 |
| 20 | Craig Mellon | 16 | East Lothian | 1:04.22 | 29.73 | 1:04.22 |
| | | | | | |
| 21 | Andrew Gatton | 17 | Highland | 1:04.36 | 29.50 | 1:04.36 |
| 22 | Cameron Gordon | 14 | Dumfries | 1:04.54 | 29.29 | 1:04.54 |
| | | | | | |
| 23 | David Smith | 25 | Aberdeen Dol | 1:04.72 | 29.64 | 1:04.72 |
| 24 | Finlay Saunders | 17 | Heart Of Mid | 1:05.15 | 30.33 | 1:05.15 |
| 25 | Andrew Arthur | 16 | Aberdeen | 1:07.86 | 30.36 | 1:07.86 |
| -- | Stefan Krawiec | 12 | East Lothian | DQ | | |
| -- | Dylan Griffiths | 16 | Swim Ulster | DQ | | |