| Event: | Men's 4 × 400 metres relay |
| Competition: | 2021 World Athletics Relays |
| Venue: | Silesian Stadium |
| Dates: | 1 May (heats) & 2 May (final) |
| Nations: | 15 |
| Win Value: | 3:03.45 |
| Gold: | Jochem Dobber Liemarvin Bonevacia Ramsey Angela Tony van Diepen |
| Goldnoc: | NED |
| Silver: | Rikuya Ito Kaito Kawabata Kentaro Sato Aoto Suzuki |
| Silvernoc: | JPN |
| Bronze: | Isaac Makwala Boitumelo Masilo Ditiro Nzamani Leungo Scotch |
| Bronzenoc: | BOT |
| Prev: | 2019 |
| Next: | 2024 |
The men's 4 × 400 metres relay at the 2021 World Athletics Relays was held at Silesian Stadium on 1 and 2 May.[1]
Prior to the competition, the records were as follows:[2]
| World record |  United States(Andrew Valmon, Quincy Watts, Harry Reynolds, Michael Johnson) | 2:54.29 | Stuttgart, Germany | 22 August 1993 | |
| Championship record | United States (David Verburg, Tony McQuay, Christian Taylor, LaShawn Merritt | 2:57.25 |  Nassau, Bahamas | 25 May 2014 | |
| World Leading | North Carolina A&T (Daniel Stokes, Randolph Ross, Elijah Young, Trevor Stewart) | 3:00.23 | Austin, United States | 27 March 2021 |
Qualification: First 2 of each heat (Q) plus the 2 fastest times (q) advanced to the final.[3]
The Netherlands confirms the first place obtained in the heats summary.[4]
| Rank | Nation | Athletes | Time | Notes | |
|---|---|---|---|---|---|
| Jochem Dobber, Liemarvin Bonevacia, Ramsey Angela, Tony van Diepen | 3:03.45 | ||||
| , Kaito Kawabata, Kentaro Sato, Aoto Suzuki | 3:04.45 | ||||
| Isaac Makwala, Boitumelo Masilo, Ditiro Nzamani, Leungo Scotch | 3:04.77 | ||||
| 4 | Lorenzo Benati, Alessandro Sibilio, Brayan Lopez, Vladimir Aceti | 3:05.11 | |||
| 5 | Lythe Pillay, Zakhiti Nene, Ranti Marvin Dikgale, Oscar Mavundla | 3:05.76 | |||
| 6 | Jhon Perlaza, Yilmar Herrera, Jhon Solís, Anthony Zambrano | 3:05.91 | |||
| 7 | Victor Coroller, Gilles Biron, Ludovic Ouceni, Muhammad Kounta | 3:06.16 | |||
| 8 | Jonathan Sacoor, Robin Vanderbemden, Dylan Borlée, Kevin Borlée | 3:10.74 |