- Who
- USA
- What
- 3:08:80 minute(s):second(s)
- Where
- Hungary (Budapest)
- When
The fastest relay 4 x 400 metres (mixed) is 3:08.80 seconds and was achieved by USA (represented by Justin Robinson, Rosey Effiong, Matthew Boling and Alexis Holmes) at the World Athletics Championships 2023 in Budapest, Hungary, on 19 August 2023.
The United States won a World Championship gold with a world record in the mixed 4x400 metres relay.