There are many cases of conduct for which responsibility can plausibly be ascribed to a group, in addition to any responsibility ascribable to the group's constituent members. It is important to be able to make such ascriptions because without them we are unable to assign responsibilities for many sorts of humanly-caused harms for which responsibility cannot reasonably be ascribed to individuals alone. Two recent theories of collective responsibility advance our understanding of why it is important to be able to hold (...) groups accountable, but they apply only to a limited spectrum of groups, and rely on the plausibility of importing unnecessary individualistic assumptions into discussions of collective responsibility. ;I argue that we can justify ascription of collective responsibility without engaging in difficult metaphysical or ontological disputes. In particular, in order legitimately to ascribe collective responsibility we need not demonstrate that groups are capable of exhibiting intentions, or that groups can be considered 'moral persons'. We may reasonably consider organized groups to take action, and we may justly blame or praise them, when their members engage in what I call 'joint purposive behavior', as when an automobile manufacturer knowingly markets faulty vehicles. I argue, further, that certain unorganized groups, or 'random collectivities', can justly be blamed for promoting values and attitudes conducive to harmful behavior, as when a hate group advocates violent actions against minorities, or praised as groups for promoting values that encourage laudable behavior. ;I argue that most objections to collective responsibility rely on various misunderstandings of what it means for a group to be collectively responsible, notably, the belief that if a group is responsible its members cannot also be individually responsible, and the belief that collective responsibility 'distributes' among the individuals in the responsible group. In addition, I argue that large-scale environmental problems such as global warming lend themselves to a collectivist analysis, and that a view of collective responsibility that balances the harm-prevention and fault-finding purposes of responsibility ascription may help us to resolve such problems. (shrink)