| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Butterfly | 1:13.12 | 2025 NYAC Cup | 2025-11-14 |
| 100m Freestyle | 1:07.22 | 2025 NYAC Cup | 2025-11-14 |
| 200m Freestyle | 2:24.27 | 2025 NYAC Cup | 2025-11-14 |
| 200m IM | 2:46.83 | 2025 Candy Cane Invitational | 2025-12-12 |
| 400m Freestyle | 5:09.57 | 2025 NYAC Cup | 2025-11-14 |
| 50m Butterfly | 33.57 | 2025 NYAC Cup | 2025-11-14 |
| 50m Freestyle | 30.37 | 2025 NYAC Cup | 2025-11-14 |
| 800m Freestyle | 10:57.60 | 2025 AGD Distance Central | 2025-11-01 |
O'Regan, Mary-Lou's top personal bests include 100m Butterfly (1:13.12), 100m Freestyle (1:07.22), 200m Freestyle (2:24.27), 200m IM (2:46.83), 400m Freestyle (5:09.57).
O'Regan, Mary-Lou swims for Halifax Trojan Aquatic Club.
O'Regan, Mary-Lou has competed in 4 meets.