Fastest swim long course 100 metres butterfly (female)
- Who
- Gretchen Walsh
- What
- 54.60 second(s)
- Where
- United States (Fort Lauderdale)
- When
- 03 May 2025
The fastest swim long course 100 metres butterfly (female) is 54.60 seconds, achieved by Gretchen Walsh (USA) in Fort Lauderdale, Florida, USA, on 3 May 2025.
Walsh lowered her own world record twice in one day while competing at the 2025 TYR Pro Swim Series, setting times of 55.09 and 54.60 seconds.