The Spanish Civil War stirred an array of humanitarian relief campaigns in France that placed women in the front lines of popular mobilization. As communists, socialists, liberals, antifascists, feminists and pacifists, French women invoked the iconography and language of sexual difference to construct pro-Republican aid appeals as an expression of gendered social concern above party politics. Through exploring the female leaderships, organization, and popular participation in different relief campaigns, this article emphasizes the extent to which Spanish aid efforts were dominated by tensions within the Front Populaire.