Humanity is radically and pervasively interdependent. Catholic social teaching uses solidarity as the lens through which to critically examine our interdependence. Solidarity is multifaceted, at once a feeling, an attitude, and a duty, with each of these building to culminate in the virtue. How is solidarity a virtue? What are the habits and practices by which it is cultivated? To whom does it apply? And what, if any, are corresponding vices? This article proposes that solidarity is both an individual virtue and a social virtue. By offering an examination of the anatomy of this social virtue, this article will propose the scope and boundaries of solidarity, corresponding sets of vices for this virtue, and the cultivation of this virtue by communities through practicing respect for human rights.