The men's 4 × 400 metres relay at the 2024 World Athletics U20 Championships was held at the Estadio Atlético de la VIDENA in Lima, Peru on 30 and 31 August 2024.

Records U20 standing records prior to the 2024 World Athletics U20 Championships were as follows: RecordNationMarkLocationDateWorld U20 Record3:00.33Trujillo, Peru23 July 2017Championship Record3:01.09Grosseto, Italy18 July 2024World U20 Leading3:01.68Gainesville, United States30 March 2024

Results Heats First 2 of each heat (Q) plus the 2 fastest times (q) qualified for the final. Heat 1 Rank Nation Athletes Time Notes1Caleb Kilpatrick, Jett Grundy, Jack Deguara, Jordan Gilbert3:08.99, 2Wiktor Wróbel, Michał Kijewski, Adrian Wójciak, Stanisław Strzelecki3:10.713Shadane Smith, Omary Robinson, Javaughn Pinnock, Kemarrio Bygrave3:11.304David García, Adrian Priego, Joe Pons, Biel Cirujeda3:11.455Qwanell Pierre, Kemron Mathlyn, Devonie Ferguson, Joshem Sylvester3:16.676Anderson Tavara, Jeffrey Cajo, Giancarlo Bravo, Matias Villar3:17.63Simone Gilberto, Luca Marsicovetere, Riccardo Fumagalli, Francesco De Santis

Heat 2 Rank Nation Athletes Time Notes1Grant Buckmiller, Xavier Donaldson, Gabriel J Clement II, Alexander Rhodes3:05.16, 2Bryan Katoo, Sihle Mahlangu, Kryn Romijn, Udeme Okon3:08.84, 3Conor Kelly, Adam Courtney, Sean Doggett, Stephen Mannion3:08.94, 4Max Husseman, Fabian Straberg, Tom Stöber, Cedric Barth3:08.98 (.978)5Malachi Austin, Kaidon Persaud, Gil De Neilson, Enock Munroe3:11.386Naif Alsubaie, Meshal Hazazi, Musaad Al-Subaie, Ali Almuwallad3:13.197Nonthawat Phakdeechit, Khunaphat Kaijan, Namchok Phuphaeng, Phiraphat Ponjon3:18.81

Heat 3 Rank Nation Athletes Time Notes1Ryota Oishi, Kentaro Shirahata, Kairi Gonda, Kyo Kikuta3:07.04, 2Rihan Chaudhary, Ankul, Abiram Pramod, Jay Kumar3:08.10, 3Lefatshe Seleka, Keorapetse Oreokame, Justice Oratile, Thabang Monngathipa3:08.98 (.978), 4Mahamat Maha, Khalid Adoum, Oussama Swakar, Maizen Ali3:11.455Joshua Perry, Daeshaun Cole, Dorian Charles, Kyrell Thomas3:11.676Paulo Romualdo, Marcus Velasco, Carlos Eduardo Domingos, Victor Chaves3:12.68

Final Rank Nation Athletes Time NotesJayden Davis, Xavier Donaldson, Alexander Rhodes, Sidi Njie3:03.56Bryan Katoo, Sihle Mahlangu, Niabulo Mbatha, Udeme Okon3:05.22Caleb Kilpatrick, Jett Grundy, Jack Deguara, Jordan Gilbert3:05.534Jakub Szarapo, Michał Kijewski, Jan Śmietanka, Stanisław Strzelecki3:06.375Ryota Oishi, Kentaro Shirahata, Kairi Gonda, Kyo Kikuta3:06.946Rihan Chaudhary, Ankul, Abiram Pramod, Jay Kumar3:08.767Conor Kelly, David Davitt, Sean Doggett, Stephen Mannion3:09.738Max Husseman, Fabian Straberg, Tom Stöber, Cedric Barth3:14.04Lefatshe Seleka, Keorapetse Oreokame, Justice Oratile, Enerst Kumevu

References