The women's 4 × 400 metres relay at the 2019 IAAF World Relays was held at the Nissan Stadium on 11 and 12 May.

Prior to the competition, the records were as follows: Qualification: First 2 of each heat (Q) plus the 2 fastest times (q) advanced to the final A.

The next 8 fastest times qualified for the final B.

[1][2] [4] [5]