Top personal bests across all competitions
| # | Name | Team | Age | Time | Date |
|---|---|---|---|---|---|
| 1 | Cheuk, Ming Ho CPS · 19 | CPS | 19 | 49.15 | 2021-06-02 |
| 2 | To, Kenneth King Him |
| LWS |
| 25 |
| 49.22 |
| 2018-04-16 |
| 3 | Ho, Ian Yentou SCA · 24 | SCA | 24 | 49.97 | 2021-06-02 |
| 4 | Cheah, Geoffrey Robin SCA · 24 | SCA | 24 | 50.02S qQT | 2015-04-14 |
| 5 | Cheung, Kin Tat Kent CPS · 22 | CPS | 22 | 50.15 | 2015-01-09 |
| 6 | Li, Sing Hoi WTS · 20 | WTS | 20 | 50.89 | 2025-08-18 |
| 7 | Wong, Chen Ho Jeremy HTA · 24 | HTA | 24 | 50.92 | 2018-04-16 |
| 8 | Ng, Cheuk Yin TPS · 17 | TPS | 17 | 50.99 | 2019-11-28 |
| 9 | Lam, Ho Yin Martin HJC · 20 | HJC | 20 | 51.00 | 2019-04-13 |
| 10 | Chan, Nathan DWA · 22 | DWA | 22 | 51.04 | 2025-08-18 |
| 11 | Lau, Ping Chi HTA · 21 | HTA | 21 | 51.07 | 2024-07-15 |
| 12 | Lim Nicholas, Owen Zhaoguang LRC · 20 | LRC | 20 | 51.08 | 2021-06-20 |
| 13 | Ho, Siu Lun DLS · 20 | DLS | 20 | 51.22 | 2024-07-15 |
| 14 | Ng, Chun Nam Derick WTS · 22 | WTS | 22 | 51.22 | 2016-08-03 |
| 15 | Yu, Chi Lung PSC · 17 | PSC | 17 | 51.41 | 2025-08-18 |
| 16 | Koo, Ralph Yat Ho HTA · 26 | HTA | 26 | 51.45 | 2024-07-15 |
| 17 | Wong, Lok Kan HTA · 21 | HTA | 21 | 51.48 | 2025-08-18 |
| 18 | Yu, Dongqi HTA · 17 | HTA | 17 | 51.49 | 2025-11-03 |
| 19 | Chen, Cheuk Fung SCA · 21 | SCA | 21 | 51.58 | 2018-08-13 |
| 20 | Cai, Qi Hong CPS · 17 | CPS | 17 | 51.66 | 2024-05-17 |
| 21 | Wan, Chun Lim PSC · 19 | PSC | 19 | 51.70 | 2025-11-03 |
| 22 | Williams, Miles Jing SCA · 19 | SCA | 19 | 51.86B qQT | 2017-07-31 |
| 23 | Lau, Shiu Yue HTA · 26 | HTA | 26 | 51.90 | 2024-05-17 |
| 24 | Mak, Ho Lun Raymond HTA · 25 | HTA | 25 | 51.90B qQT | 2018-04-16 |
| 25 | Lo, Tsz Lam WTS · 17 | WTS | 17 | 51.90 | 2024-11-18 |