Mental illness is an issue of great practical importance. Yet, despite sustained inquiry from scientists and philosophers alike, relatively little attention has been paid to the significance of mental disorder to agency and responsibility. While there is some work that touches on the topic, and a few extended treatments of particular disorders, these only scratch the surface. Agency in Mental Disorder seeks to provide a starting point for deeper and broader philosophical analyses. The 8 new essays in this book address various questions about the relationship between agency and mental disorder. What is the nature of that relationship? In what ways do mental disorders affect capacities for control? How should we understand the mitigations of blame that mental disorders seem to provide, and can we generalize from specific disorders to any interesting claims about disorders as a class? And what makes for a mental disorder in the first place?