Fastest swim long course 400 metres freestyle (female)
- Who
- Summer McIntosh
- What
- 3:54.18 minute(s):second(s)
- Where
- Canada (Victoria)
- When
- 07 June 2025
The fastest swim long course 400 metres freestyle (female) is 3 minutes 54.18 seconds, achieved by Summer McIntosh (Canada) in Victoria, British Columbia, Canada, on 7 June 2025.
McIntosh set new world records in the 200 m medley, 400 m medley and 400 m freestyle at the 2025 Canadian Swimming Trials. She destroyed the previous world record in the 400 m freestyle by 1.2 seconds.