Collective intentionality is of central importance in social ontology. In this paper, we will discuss its role in Searle’s understanding of social ontology and institutional reality. The first section of the paper will reconstruct Searle’s understanding of social ontology and his identification of necessary elements for constructing institutional reality. In this section, we will discuss the notions of imposition of function, of collective intentionality, and of constitutional rule. The second section will critically re-examine the notion of collective intentionality. The third (...) section will contrast Searle’s understanding of institutional reality with the one based on evolutionary game theory. Taking into account that Searle describes his position as naturalistic, the main task of this section will be to examine to what extent the alternative theory, also naturalistic in its character, can address certain problems, which remain insolvable in the framework of Searle’s theory. (shrink)