The article examines the development of medieval philosophy studies in Italy over the last century from the specific point of view of historico-critical editions and of the philology of philosophical texts. The main publications, methods, and interests in this field of research are reviewed. The role played by leading scholars such as Eugenio Garin, Mario Dal Pra, Sofia Vanni Rovighi, and Bruno Nardi in promoting a new philological approach to the medieval philosophical tradition is investigated, and Eugenio Garin's special contribution in consolidating this kind of approach to philosophical historiography in Italy is highlighted.