The –Womens×women's 4 × 100 metre freestyle relay event at the 2020 Summer Olympics will be held in 2021 at the Tokyo Aquatics Centre. It will be the event's twenty-fifth appearance at the Olympics, having been held at every edition since 1912.
Records
Prior to this competition, the existing world and Olympic records were as follows.
The following records were established during the competition:
Qualification
The top 12 teams in this event at the 2019 World Aquatics Championships qualified for the Olympics. An additional 4 teams will qualify through having the fastest times at approved qualifying events during the qualifying period (1 March 2019 to 30 May 2020).
Competition format
The competition consists of two rounds: heats and a final. The relay teams with the best 8 times in the heats advance to the final. Swim-offs are used as necessary to break ties for advancement to the next round.
Schedule
All times are Japan Standard Time (UTC+9)
Results
Heats
The relay teams with the top 8 times, regardless of heat, advance to the final.