Roneisha McGregorJanieve RussellShericka JacksonCandice McLeodJunelle Bromfield*Stacey-Ann Williams* The women's 4 × 400 metres relay event at the 2020 Summer Olympics took place on 5 and 7 August 2021 at the Japan National Stadium.

Kaylin Whitney, Wadeline Jonathas, Kendall Ellis and Lynna Irby combined to produce the fastest time in the semi-final round, more than a second faster than Jamaica, who also held two runners in reserve.

Great Britain was the only other team to dare holding two in reserve, also qualifying with the fourth fastest time.

Leading off on her 22nd birthday, newly crowned Olympic 400 hurdles champion and world record holder Sydney McLaughlin made up the 3 turn stagger distance on Belgium's Naomi Van Den Broeck in the first 200 metres.

Already the most decorated female track athlete in Olympic history, Felix took USA through to a 5-metre lead at the break line with veterans Iga Baumgart-Witan (POL) and Janieve Russell (JAM) battling down the backstretch in hot pursuit with only Canada on the end of the group separating from the other teams.

Then reality set in, Baumgart-Witan would get no closer as Felix opened up the gap on the final straightaway passing to 2016 400 hurdle champion and previous world record holder, Dalilah Muhammad 6 metres ahead.

Behind them, Canada 's from Madeline Price to Kyra Constantine got the jump on Jamaica's pass from Russell to 100 bronze medalist Shericka Jackson to take over third.

Due to the COVID-19 pandemic, the period was suspended from 6 April 2020 to 30 November 2020, with the end date extended to 29 June 2021.