San Leonardo de Yagüe is a Spanish town and municipality located in the province of Soria, in the autonomous community of Castile and León. It is one of the most populated municipalities of the Sorian county of Pinares. It has primary and secondary schools (I.E.S. San Leonardo), attended by students from surrounding municipalities (Navaleno, Hontoria del Pinar, Casarejos, Espeja, Espejón, La Hinojosa, and others).