Abstract Autophagy, a process for cellular cleaning through the removal of intracellular components in lysosomes, is a well conserved mechanism from yeast to mammalian cells, and also contributes to the maintenance of cellular homeostasis and of the energetic balance, in cellular and tissue remodeling, and cellular defense against extracellular insults and pathogens. The role of autophagy in placentation has been clarified. Autophagy is induced in trophoblasts under physiological hypoxia during early pregnancy and seems to have a role in placentation. Recent findings suggest that impaired autophagy might induce poor placentation in preeclamptic cases. In this review, we discuss the role of autophagy and summarize the role of autophagy-related genes in placentas.