Top personal bests across all competitions
| # | Name | Team | Age | Time | Date |
|---|---|---|---|---|---|
| 1 | To, Kenneth King Him LWS · 25 | LWS | 25 | 47.64 | 2018-12-03 |
| 2 | Ng, Cheuk Yin |
| TPS |
| 17 |
| 48.95 |
| 2019-12-02 |
| 3 | Cheuk, Ming Ho CPS · 21 | CPS | 21 | 49.06 | 2023-05-29 |
| 4 | Chan, Nathan DWA · 21 | DWA | 21 | 49.20 | 2025-02-10 |
| 5 | Cheung, Kin Tat Kent CPS · 23 | CPS | 23 | 49.38 | 2016-03-14 |
| 6 | Ho, Siu Lun DLS · 19 | DLS | 19 | 49.47 | 2023-05-29 |
| 7 | Lam, Ho Yin Martin HJC · 20 | HJC | 20 | 49.53 | 2019-03-08 |
| 8 | Koo, Ralph Yat Ho HTA · 24 | HTA | 24 | 49.68 | 2022-09-05 |
| 9 | Cai, Qi Hong CPS · 19 | CPS | 19 | 49.82 | 2026-02-10 |
| 10 | Yu, Dongqi HTA · 17 | HTA | 17 | 49.84 | 2025-02-10 |
| 11 | Lo, Tsz Lam WTS · 17 | WTS | 17 | 49.95 | 2025-01-22 |
| 12 | Wong, Chen Ho Jeremy HTA · 23 | HTA | 23 | 50.02 | 2018-12-03 |
| 13 | Lau, Shiu Yue HTA · 26 | HTA | 26 | 50.10 | 2024-02-05 |
| 14 | Wong, Lok Kan HTA · 20 | HTA | 20 | 50.15 | 2025-02-10 |
| 15 | Li, Sing Hoi WTS · 18 | WTS | 18 | 50.25 | 2024-02-05 |
| 16 | Lim Nicholas, Owen Zhaoguang LRC · 17 | LRC | 17 | 50.40 | 2019-03-08 |
| 17 | So, Kwun Wa WDA · 17 | WDA | 17 | 50.42 | 2025-02-10 |
| 18 | Williams, Miles Jing SCA · 18 | SCA | 18 | 50.55 | 2016-03-14 |
| 19 | Yu, Chi Lung PSC · 16 | PSC | 16 | 50.64 | 2025-02-10 |
| 20 | Ng, Chun Nam Derick WTS · 20 | WTS | 20 | 50.67 | 2015-03-17 |
| 21 | Yuen, Kai Ho HTA · 19 | HTA | 19 | 50.72 | 2022-09-05 |
| 22 | Lau, Kin Hei James HTA · 15 | HTA | 15 | 50.86 | 2023-12-12 |
| 23 | Li, Hoi Man Calvin CPS · 17 | CPS | 17 | 50.87 | 2026-02-10 |
| 24 | Law, Siu Chung HVA · 21 | HVA | 21 | 50.88 | 2019-03-08 |
| 25 | Cheung, Man Ho SLA · 15 | SLA | 15 | 50.90 | 2026-02-10 |