Shared intentionality is a phenomenon where groups of people share mental states. In the last three decades, shared intentionality has become a topic of intense research in both philosophy and the sciences. The aim of this course is to survey state-of-the art philosophical and scientific research into shared intentionality. We will be reading a combination of research in historical and contemporary philosophy, and in current work in cognitive science, evolutionary anthropology, primatology, and developmental and comparative psychology. Particular focus is directed at the attempt to integrate this research into a unified understanding of the place of shared intentionality in the lives of human beings, understood as rational animals. Because an interdisciplinary stance on this topic characterizes some of the work undertaken by philosophers here at the University of Hradec Králové, at the end of the semester we will look at research that is ongoing with the faculty here.