2024 World Athletics Relays – Mixed 4 × 400 metres relay

The mixed 4 × 400 metres relay at the 2024 World Athletics Relays was held at the Thomas Robinson Stadium in Nassau, Bahamas on 4 and 5 May 2024.

Records
Prior to the competition, the competition records were as follows:

Round 1
Qualification: First 2 of each heat (Q) advance to the final and qualify for the 2024 Olympic Games. The remaining teams advance into a repechage round, where they get another chance for Olympic qualification.
 * {{legend|ccffcc|Q Qualified}}
 * OG* = 2024 Olympic Games qualification

Repechage round
First 2 of each heat (OG*) qualify for the 2024 Olympic Games.

Final
The final was started on 5 May 2024 on 21:54.