The present article examines the situation of girls in Spanish academic secondary education during the first Francoism. It outlines the measures introduced by the Franco Regime that maintained the traditional access for girls to the same academic curriculum followed by boys, although in separate schools. Later, it examines the various projects put forward specifically for female secondary schooling that sought to remove girls from the academic pathway and the reasons for their failure. Finally, the article studies the paradox posed by the fact that, despite official statements against academic education for women, the number of girls in academic secondary education and universities did not stop growing during the first Francoism. For the explanation of this paradox, it seeks to address the unwanted effects of Francoist education policy, especially the effects of social elitism and single-sex education on the presence of girls. (Contains 4 figures and 13 notes.)