| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:00.75 | 2025 Age Group International LC | 2025-06-05 |
| 100m Backstroke | 58.44 | Badger Invitational | 2025-10-19 |
| 100m Breaststroke | 1:12.60 | 2025 Age Group International LC | 2025-06-05 |
| 100m Butterfly | 1:00.02 | 2025 Age Group International LC | 2025-06-05 |
| 100m Freestyle | 54.39 | 2025 Age Group International LC | 2025-06-05 |
| 100m Freestyle | 53.18 | MACU Tri Meet with UOG & WAT | 2026-01-17 |
| 1500m Freestyle | 16:02.71 | 2026 OUA Swimming Championships | 2026-02-19 |
| 200m Backstroke | 2:12.98 | 2025 Age Group International LC | 2025-06-05 |
| 200m Backstroke | 2:07.37 | 2026 OUA Swimming Championships | 2026-02-19 |
| 200m Freestyle | 1:58.49 | 2025 Age Group International LC | 2025-06-05 |
| 200m Freestyle | 1:53.61 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 400m Freestyle | 4:01.76 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
Brian Dietz's top personal bests include 100m Backstroke (1:00.75), 100m Backstroke (58.44), 100m Breaststroke (1:12.60), 100m Butterfly (1:00.02), 100m Freestyle (54.39).
Brian Dietz swims for McMaster University.
Brian Dietz has competed in 9 meets.