| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:25.79 | June Performance Meet 2025 | 2025-06-06 |
| 100m Backstroke | 1:21.13 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 1:46.68 | MAC Winter Invitational | 2026-01-22 |
| 100m Butterfly | 1:27.45 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 100m Freestyle | 1:08.50 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Freestyle | 1:08.60 | Western Region Short Course Championships | 2026-02-12 |
| 200m Backstroke | 3:01.08 | MAC Winter Invitational | 2026-01-22 |
| 200m Backstroke | 2:52.12 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 200m Breaststroke | 3:27.45 | 2025 HAC Steeltown Invitational | 2025-11-28 |
| 200m Freestyle | 2:31.03 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Freestyle | 2:28.33 | Western Region Short Course Championships | 2026-02-12 |
| 200m IM | 2:55.52 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m IM | 2:48.93 | Western Region Short Course Championships | 2026-02-12 |
| 400m Freestyle | 5:17.49 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 400m Freestyle | 5:14.11 | Western Region Short Course Championships | 2026-02-12 |
| 400m IM | 6:42.25 | June Performance Meet 2025 | 2025-06-06 |
| 400m IM | 6:01.51 | Western Region Short Course Championships | 2026-02-12 |
| 50m Backstroke | 39.83 | MAC Winter Invitational | 2026-01-22 |
| 50m Backstroke | 38.04 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 48.41 | MAC Winter Invitational | 2026-01-22 |
| 50m Breaststroke | 45.27 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Butterfly | 39.47 | Western Region Long Course Championships | 2025-06-13 |
| 50m Butterfly | 36.87 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Freestyle | 31.77 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Freestyle | 31.34 | Western Region Short Course Championships | 2026-02-12 |
| 800m Freestyle | 11:02.77 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 800m Freestyle | 10:44.15 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
Mawdsley, Olivia's top personal bests include 100m Backstroke (1:25.79), 100m Backstroke (1:21.13), 100m Breaststroke (1:46.68), 100m Butterfly (1:27.45), 100m Freestyle (1:08.50).
Mawdsley, Olivia swims for Hamilton Aquatic Club.
Mawdsley, Olivia has competed in 9 meets.