The focus of the texts by Gilbert Ryle and Adolf Reinach, collected in this volume entitled Social and Negative Social Acts is the illumination and definition of two fundamental types of intersubjective acts: social and negative acts. While the former must have a manifest form, be externalized and directed towards the other, towards one or more addressees; negative acts are characterized by delaying the performance of an action, that is, the intentional or unintentional absence of action. By juxtaposing texts by authors belonging to the “continental” and “analytical” tradition of philosophy, Adolf Reinach (“Social Acts,” “Social and Non-Social Acts”) and Gilbert Ryle (“Negative ʻActionsʼ”), and complementing them with a foreword by Petar Bojanic, the volume illuminates one of the key problems of social ontology.