The women's 4 × 400 metres relay at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 14 and 15 July 2012.
The women's 4 × 400 metres relay at the 2012 World Junior Championships in Athletics was held at the Estadi Olímpic Lluís Companys on 14 and 15 July 2012. (en)
A prova dos 4x400 metros feminino do Campeonato Mundial Júnior de Atletismo de 2012 ocorreu entre os dias 14 e 15 de julho em Barcelona, na Espanha. (pt)