Within territorial communities, social actions and especially their members’ behavior and interpersonal style have a critical role in shaping the effects of their social participation on their social well-being. The present study aims to explore the role of the Sense of Responsible Togetherness (SoRT) played in the relationship between social participation and social wellbeing. Three-hundred and fifty questionnaires were administered to Italian citizens living in the Campania Region. From the analyses, the SoRT proved to be a partial mediator in the above-mentioned relationship. These results highlight the significance that interventions which can foster a different and more responsible perception about the relational contexts and produce a greater well-being could have.