The men's 4 × 100 metres relay event at the 1951 Pan American Games was held at the Estadio Monumental in Buenos Aires on 5 and 6 March.

Medallists GoldSilverBronzeDonald CampbellArt BraggDick AttleseyJohn VoightRaúl MazorraAngel GarcíaJesús FarrésRafael FortúnGerardo BönnhoffAdelio MárquezFernando LapuenteMariano Acosta

Results Heats Rank Heat Nation Athletes Time Notes 1 1 Donald Campbell, Art Bragg, Dick Attlesey, John Voight 41.3 Q 2 1 Raúl Mazorra, Angel García, Jesús Farrés, Rafael Fortún 41.7 Q 3 1 Gerardo Bönnhoff, Adelio Márquez, Fernando Lapuente, Mariano Acosta 41.9 q 4 1 Leonel Contreras, Rodolfo López, Gustavo Ehlers, Fernando Salinas 42.2 q 1 2 Aristipo Lerma, Armando Muñoz, Alfaro Parra, Jaime Aparicio 43.2 Q 2 2 Oscar Maldonado, Santiago Ferrando, Miguel León, Gerardo Salazar 43.3 Q 3 2 Celso González, Alfredo Rodas, Fermín Villalba, José Zelaya 43.8

Final Rank Nation Athletes Time Notes Donald Campbell, Art Bragg, Dick Attlesey, John Voight 41.0 Raúl Mazorra, Angel García, Jesús Farrés, Rafael Fortún 41.2 Gerardo Bönnhoff, Adelio Márquez, Fernando Lapuente, Mariano Acosta 41.8 4 Leonel Contreras, Rodolfo López, Gustavo Ehlers, Fernando Salinas 42.3 5 Aristipo Lerma, Armando Muñoz, Alfaro Parra, Jaime Aparicio 42.8 6 Oscar Maldonado, Santiago Ferrando, Miguel León, Gerardo Salazar

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