The mixed 4 × 400 metres relay at the 2019 IAAF World Relays was held at the Nissan Stadium on 11 and 12 May. Records Prior to the competition, the records were as follows: Results Heats Qualification: First 2 of each heat (Q) plus the 2 fastest times (q) advanced to the final. Final References 4 x 400 metres relay 4 × 400 metres relay