This chapter explores the account of anger in Aristotle’s works, looking at its place in his theories of human action, biology, and happiness. Anger can be done in a proper way; although Aristotle describes the mean through the word for “gentleness,” one can be too apathetic and not be angered properly. Anger can go wrong in many ways, including bitterness and irascibility, but it is also the proper reaction to injustice and injuries. To lack a response to an injustice is shameful. Aristotle’s view of anger might seem no longer one we are sympathetic to, but it offers a better account of good anger than the scattered ideas about anger that suffuse our culture. This is particularly true because it is understood within the political life of Athens—one where citizens need to take an active role on their own behalf.