The women's 4 × 100 metres relay event at the 1955 Pan American Games was held at the Estadio Universitario in Mexico City on 16 March.Full results

Results Rank Nation Athletes Time Notes Isabelle Daniels, Mabel Landry, Mae Faggs, Barbara Jones 47.12 GR Lilián Heinz, Lilián Buglia, Gladys Erbetta, María Luisa Castelli 47.27 Betty Kretschmer, Carmen Venegas, Eliana Gaete, Elda Selamé 49.49 4 Esther Villalón, Alma Rodríguez, Graciela Villalón, Sara Pantoja 51.33

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