Fastest swim short course 100 metres backstroke (female)
- Who
- Regan Smith
- What
- 54.02 second(s)
- Where
- United States (Westmont)
- When
- 18 October 2025
The fastest swim short course 100 metres backstroke (female) is 54.02 seconds, achieved by Regan Smith (USA) in Budapest, Hungary, on 15 December 2024; and also in Westmont, Illinois, USA, on 18 October 2025.
Regan Smith equalled her record time from the 2024 World Aquatics Swimming Championships (25m) while competing at the World Aquatics Swimming World Cup 2025 in Westmont.