This chapter provides an overview of some of the foundational work and methods on neuroeconomic approaches to studying social decision-making, that is, where individuals make choices in social contexts, balancing personal preferences with the values, beliefs, and expectations of others. Outlining three core aspects of social decision-making—trust, cooperation, and resource allocation—we discuss the experimental paradigms used to examine each, and highlight the insights gained into the psychological and neural mechanisms underlying social interactions. We conclude with a discussion of new approaches that have the potential to expand our current understanding of social decision-making.