# 2021 World Athletics U20 Championships – Men's 4 × 100 metres relay

The men's 4 × 100 metres relay at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 21 and 22 August.

## Records

Standing records prior to the 2021 World Athletics U20 Championships :
| World U20 Record | United States | 38.62 | San José, Costa Rica | 20 July 2019 |
| Championship Record | United States | 38.66 | Grosseto, Italy | 18 July 2004 |
| World U20 Leading | Brazil | 38.90 | Chula Vista, United States | 24 April 2021 |

## Results
### Heats

Qualification: First 3 of each heat ( Q ) plus the 2 fastest times ( q ) qualified for the final.
| Rank | Heat | Nation | Athletes | Time | Notes |
| 1 | 1 | Poland | Dominik Łuczynski, Patryk Krupa, Jakub Pietrusa, Oliwer Wdowik | 38.93 | Q, AU20R |
| 2 | 1 | Jamaica | Alexavier Monfries, Bryan Levell, Andrew Gilipps, Sandrey Davison | 39.00 | Q, SB |
| 3 | 2 | South Africa | Mihlali Xhotyen, Henru Olivier, Letlhogonolo Moleyane, Bradley Oliphant | 39.33 | Q, AU20R |
| 4 | 1 | Nigeria | Kingsley Emeka Unorji, Ogheneovo Nicholas Mabilo, Adekalu Nicholas Fakorede, Godson Oke Oghenebrume | 39.33 | Q, NU20R |
| 5 | 2 | Italy | Angelo Ulisse, Matteo Melluzzo, Filippo Cappelletti, Lorenzo Ndele Simonelli | 39.56 | Q, SB |
| 6 | 1 | Colombia | Néider Abello, John Paredes, Jhon Berrío, Carlos Flórez | 40.04 | q, NU20R |
| 7 | 2 | Greece | Konstantinos Milios, Ioannis Kariofyllis, Ioannis Granitsiotis, Nikolaos Panagiotopoulos | 40.13 | Q, NU20R |
| 8 | 2 | Saudi Arabia | Nasser Mahmoud Mohammed, Ali Ahmed Ali, Sultan Kaabi, Anbar Jamaan Al-Zahrani | 40.40 | q, SB |
| 9 | 1 | Eswatini | Lihle Gininindza, Ayanda Malaza, Bongumenzi Mbingo, Lwazi Menziwokuhle Msibi | 41.34 | NU20R |
| 10 | 1 | Finland | Eino Vuori, Arttu Peltola, Niko Kangasoja, Alexander Björkgren | 50.88 | |
| | 2 | Botswana | Allison Kenosi, Jayson Mandoze, Godiraone Lobatlamang, Tumo Stagato Lesesere | DQ | TR16.8 |
| | 2 | Ecuador | Alan Minda, Katriel Angulo, Miguel Ángel Maldonado, Steeven Salas | DQ | TR16.8 |
| | 2 | Brazil | Hygor Gabriel Bezerra, Izaias Alves, Igor Clemente Medeiros, Renan Correa | DQ | TR17.3.1 |
| | 1 | Qatar | Nayef Mubarak Al-Rashidi, Oumar Abakar, Mahamat Zakaria Khalid, Amar Ebed | DQ | TR17.3.1 |

### Final

The final was held on 22 August at 16:46.
| Rank | Lane | Nation | Athletes | Time | Notes |
| | 3 | South Africa | Mihlali Xhotyen, Sinesipho Dambile, Letlhogonolo Moleyane, Benjamin Richardson | 38.51 | WU20R |
| | 6 | Jamaica | Alexavier Monfries, Bryan Levell, Andrew Gilipps, Sandrey Davison | 38.61 | AU20R |
| | 5 | Poland | Dominik Łuczynski, Patryk Krupa, Jakub Pietrusa, Oliwer Wdowik | 38.90 | AU20R |
| 4 | 4 | Italy | Angelo Ulisse, Matteo Melluzzo, Filippo Cappelletti, Lorenzo Simonelli | 39.28 | NU20R |
| 5 | 1 | Colombia | Néider Abello, John Paredes, Jhon Berrío, Carlos Flórez | 40.00 | NU20R |
| 6 | 7 | Greece | Konstantinos Milios, Ioannis Kariofyllis, Ioannis Granitsiotis, Nikolaos Panagiotopoulos | 40.07 | NU20R |
| | 8 | Nigeria | Adekalu Nicholas Fakorede, Ogheneovo Nicholas Mabilo, Udodi Onwuzurike, Godson Oke Oghenebrume | DNF | |
| | 2 | Saudi Arabia | Nasser Mahmoud Mohammed, Ali Ahmed Ali, Sultan Kaabi, Anbar Jamaan Al-Zahrani | DQ | TR24.7 |