Top personal bests across all competitions
| # | Name | Team | Age | Time | Date |
|---|---|---|---|---|---|
| 1 | Cheuk, Ming Ho CPS · 21 | CPS | 21 | 3:46.12 | 2023-09-12 |
| 2 | So, Kwun Wa |
| WDA |
| 17 |
| 3:49.56 |
| 2025-02-10 |
| 3 | Wang, Yi Shun CPS · 15 | CPS | 15 | 3:50.45 | 2024-02-05 |
| 4 | He, Shing Ip CPS · 18 | CPS | 18 | 3:51.05 | 2024-02-05 |
| 5 | Lo, Tsz Lam WTS · 18 | WTS | 18 | 3:51.83 | 2025-12-29 |
| 6 | Liao, Xian Hao Jonathan HJC · 16 | HJC | 16 | 3:51.88 | 2016-03-14 |
| 7 | Lim Nicholas, Owen Zhaoguang LRC · 17 | LRC | 17 | 3:53.43 | 2019-03-08 |
| 8 | Williams, Miles Jing SCA · 18 | SCA | 18 | 3:53.49 | 2016-03-14 |
| 9 | Chan, Chun Hei JHC · 21 | JHC | 21 | 3:54.42 | 2018-12-03 |
| 10 | Lai, King Wo WTS · 18 | WTS | 18 | 3:54.63 | 2025-12-29 |
| 11 | Ip, Ali TPS · 18 | TPS | 18 | 3:56.56 | 2026-02-10 |
| 12 | Cheung, Kin Tat Kent CPS · 24 | CPS | 24 | 3:57.01 | 2017-03-16 |
| 13 | Sun, Maokun WTS · 14 | WTS | 14 | 3:57.16 | 2026-02-10 |
| 14 | Wong, Ming Hong HTA · 15 | HTA | 15 | 3:57.33 | 2016-03-14 |
| 15 | Kwok, Chun Hei HTA · 17 | HTA | 17 | 3:58.09 | 2021-09-14 |
| 16 | Lam, Chak Hang HVA · 17 | HVA | 17 | 3:58.15 | 2018-12-03 |
| 17 | Whittington, Peter Harry DLS · 19 | DLS | 19 | 3:59.41 | 2023-05-29 |
| 18 | Lau, Chor Tik WTS · 15 | WTS | 15 | 3:59.46 | 2024-12-30 |
| 19 | Chi, Oscar DLS · 18 | DLS | 18 | 3:59.68 | 2017-03-16 |
| 20 | Tsang, Pak Kiu SYS · 15 | SYS | 15 | 3:59.84 | 2025-12-29 |
| 21 | Chan, Wai Ching Adrian HTA · 16 | HTA | 16 | 3:59.87 | 2025-12-29 |
| 22 | Law, Lok Hei WTS · 19 | WTS | 19 | 3:59.92 | 2026-02-10 |
| 23 | Chan, Wah Royce HSW · 15 | HSW | 15 | 4:00.64 | 2023-09-12 |
| 24 | Kwong, Jacob Yat Nam WTS · 16 | WTS | 16 | 4:00.64 | 2023-09-12 |
| 25 | Chen, Eric Q HIS · 15 | HIS | 15 | 4:00.89 | 2025-02-10 |