When is it morally permissible to engage in self-defense or the defense of others? Jonathan Quong gives an original philosophical account of the central moral principles that should regulate the use of defensive force. The morality of defensive force needs to be understood in the context of a more general account of justice and moral rights. The Morality of Defensive Force is packed with forceful, novel arguments. It will no doubt become a cornerstone of work on the justifications and limits of defensive harm. It strikes a great balance between being accessible to those who want to pick it up for a particular topic-for example, those interested only in the necessity condition, the bearing of evidence on rights, or the means principle-and at the same time being a rewarding, well-integrated read.