AbstractI argue in this paper for a critical social ontology, or an approach to theorizing social reality and social institutions that is more than descriptive of social reality, but is also able to provide practical reasoning with an ontological dimension for judgment. At the heart of this idea is a different take on social metaphysics from most standard current accounts in that it begins with empirical, phylogenetic capacities of human beings for social practices (realizing abstract thought in the world) as well as relationality (the need for attachments to others). The combination of these two essential human capacities, what I call thepractical‐relational nexus, is generative of more complex social reality. The ontogeny of any social reality is the result of the ways that this practical‐relational nexus has been organized and shaped by external social structures and systems, themselves the product of certain kinds of social power. I then explore the metaphysics of social power before considering the ways that this approach to social metaphysics can inform practical reasoning with the capacity for social and political criticism.