Fastest swim long course relay 4 x 100 metres freestyle (female)
- Who
- Mollie O'Callaghan, Shayna Jack, Meg Harris, Emma McKeon
- What
- 3:27.96 minute(s):second(s)
- Where
- Japan (Fukuoka)
- When
- 23 July 2023
The fastest long course 4 x 100 metres freestyle relay by a female team is 3 minutes 27.96 seconds, achieved by Australia (Mollie O'Callaghan, Shayna Jack, Meg Harris and Emma McKeon) at the 2023 World Aquatics Championships in Fukuoka, Japan, on 23 July 2023.
The Australian team destroyed their own world record from the 2020 Tokyo Olympics by almost two seconds.