This chapter explores the relationship between an agent’s moral responsibility for their actions and the situations in which an agent acts. Decades of research in psychology are sometimes thought to support situationism, the view that features of an agent’s situation greatly influence their behavior in powerful and surprising ways. Such situational fea­tures might therefore be thought to threaten agents’ abilities to act freely and responsi­bly. This chapter begins by discussing some relevant empirical literature on situationism. It then surveys several ways (...) of construing the situationist threat to moral responsibility as reducible to worries about determinism, manipulation, or luck. It is then argued that the best way to understand the situationist challenge is as a threat to reasons-responsive­ness. A common strategy for responding to the situationist threat to reasons-responsive­ness—the so-called modal response—is discussed. The chapter then defends a view called pessimistic realism: While the situationist literature puts human agency in an unflattering light, it does not show that agents’ reasons-responsiveness capacities are generally un­dermined by situational features. Several objections both to the modal strategy and to pessimistic realism are discussed. The chapter concludes with three thoughts concerning future directions. (shrink)