The “extended mind” thesis (Clark, 2008) has focused primarily on the interactions between single individuals and cognitive artifacts, resulting in a relative neglect of interactions between people. At the same time, the idea that groups can have cognitive properties of their own has gained new ascendancy in various fields concerned with collective behavior. My main goal in this paper is to propose an understanding of group cognition as an emergent form of socially distributed cognition. To that end, I first clarify (...) the relevant notions of cognition and emergence that are at play in the contemporary debate. I then apply our conceptual framework to recent developments in the theory of transactive memory systems (Wegner, 1986), arguing that the idea of group cognition is neither trivial nor shrouded in metaphysical mystery. (shrink)