| Age | Event | Time | Name | School | Year |
|---|---|---|---|---|---|
| Open | 800m freestyle | 8:22.41 | Tom Harris | Gunnedah HS | 2008 |
| 17-19 years | 400m freestyle | 4:03.41 | Jesse Goodyear | Lucas Heights HS | 2017 |
| 15-16 years | 400m freestyle | 4:08.15 | Charlie Hawke | Merewether HS | 2018 |
| 12-14 years | 400m freestyle | 4:19.27 | Ryan Leonard | Toronto HS | 2011 |
| 17-19 years | 200m freestyle | 1:53.75 | Andrew Kennedy | Cronulla HS | 2010 |
| 16 years | 200m freestyle | 1:54.21 | Kenrick Monk | Quakers Hill HS | 2004 |
| 15 years | 200m freestyle | 1:57.91 | Kenrick Monk | Quakers Hill HS | 2003 |
| 14 years | 200m freestyle | 1:59.24 | Liam Blair | Warners Bay HS | 2026 |
| 13 years | 200m freestyle | 2:06.23 | Liam Blair | Warners Bay HS | 2025 |
| 12 years | 200m freestyle | 2:07.96 | Ryley Twiss | Callaghan College | 2021 |
| 17-19 years | 100m freestyle | 51.52 | Jacob Whitton | The Ponds HS | 2026 |
| 16 years | 100m freestyle | 52.74 | Kirk Palmer | Henry Kendall HS | 2002 |
| 15 years | 100m freestyle | 53.55 | Luke Chen | Manly HS | 2025 |
| 14 years | 100m freestyle | 53.58 | Eli Gardiner | Hunter Sports HS | 2026 |
| 13 years | 100m freestyle | 56.96 | Bradley Honor | Galston HS | 2025 |
| 12 years | 100m freestyle | 1:00.14 | Lachlan Smith | Pennant Hills HS | 2019 |
| 17-19 years | 50m freestyle | 23.13 | Joel Fleming | Great Lakes College | 2024 |
| 16 years | 50m freestyle | 23.55 | Jacob Whitton | The Ponds HS | 2025 |
| 15 years | 50m freestyle | 24.46 | Jacob Whitton | The Ponds HS | 2024 |
| 14 years | 50m freestyle | 24.79 | Eli Gardiner | Hunter Sports HS | 2026 |
| 13 years | 50m freestyle | 25.88 | Bradley Honor | Galston HS | 2025 |
| 12 years | 50m freestyle | 27.19 | Lachlan Smith | Pennant Hills HS | 2019 |
| 17-19 years | 100m backstoke | 56.58 | Daniel Arnamnart | Asquith HS | 2007 |
| 16 years | 100m backstoke | 58.24 | Daniel Arnamnart | Asquith HS | 2005 |
| 15 years | 100m backstoke | 59.47 | Daniel Arnamnart | Asquith HS | 2004 |
| 14 years | 100m backstoke | 1:00.41 | Liam Blair | Warners Bay HS | 2026 |
| 13 years | 100m backstoke | 1:04.38 | Liam Blair | Warners Bay HS | 2025 |
| 12 years | 100m backstoke | 1:07.99 | Ryan Leonard | Toronto HS | 2009 |
| 17-19 years | 100m breaststroke | 1:03.96 | Simon Cowley | Endeavour HS | 1997 |
| 16 years | 100m breaststroke | 1:05.77 | Simon Cowley | Endeavour HS | 1996 |
| 15 years | 100m breaststroke | 1:06.75 | Tomas Elliot | Gosford HS | 2010 |
| 14 years | 100m breaststroke | 1:10.24 | Ryan Leonard | Toronto HS | 2011 |
| 13 years | 100m breaststroke | 1:12.77 | Ryan Leonard | Toronto HS | 2010 |
| 12 years | 100m breaststroke | 1:17.06 | Will Rule | Gymea HS | 2017 |
| 17-19 years | 100m butterfly | 55.45 | Aleksander Gillon | Hunter Sports HS | 2026 |
| 16 years | 100m butterfly | 56.80 | Charlie Potts | Maitland HS | 2026 |
| 15 years | 100m butterfly | 58.48 | Lachlan Staples | Kincumber HS | 2005 |
| 14 years | 100m butterfly | 59.37 | Eli Gardiner | Hunter Sports HS | 2026 |
| 13 years | 100m butterfly | 1:02.16 | Henry Lee | Homebush HS | 1998 |
| 12 years | 100m butterfly | 1:05.49 | Ryan Leonard | Toronto HS | 2009 |
| 17-19 years | 400m individual medley | 4:34.96 | Phillip Bryant | Birrong HS | 1991 |
| 15-16 years | 400m individual medley | 4:39.71 | Charlie Hawke | Merewether HS | 2018 |
| 12-14 years | 400m individual medley | 4:49.16 | Luke Chen | Manly HS | 2024 |
| 17-19 years | 200m individual medley | 2:07.93 | Daniel Tranter | Westfields Sports HS | 2009 |
| 15-16 years | 200m individual medley | 2:09.88 | Luke Chen | Manly HS | 2026 |
| 12-14 years | 200m individual medley | 2:15.51 | Luke Chen | Manly HS | 2024 |
| Mixed | 12 x 50m freestyle | 5:31.10 | Cronulla HS | 2019 | |
| 12-19 years | 6 x 50m freestyle | 2:43.46 | North Sydney Boys HS | 2025 | |
| 17-19 years | 4 x 50m freestyle | 1:38.26 | Epping Boys HS | 2023 | |
| 16 years | 4 x 50m freestyle | 1:42.88 | Kingscliff HS | 2010 | |
| 15 years | 4 x 50m freestyle | 1:44.43 | Narrabeen Sports HS | 2019 | |
| 14 years | 4 x 50m freestyle | 1:47.70 | Gosford HS | 2021 | |
| 13 years | 4 x 50m freestyle | 1:54.34 | Endeavour Sports HS | 2026 | |
| 12 years | 4 x 50m freestyle | 2:06.63 | Woolgoolga HS | 1999 | |
| Open | 4 x 50m medley relay | 1:51.47 | James Ruse Agricultural HS | 2026 | |
| Mixed Open | 4 x 50m Central Schools relay | 1:56.50 | Warren CS | 2019 |