This paper discusses a classification of types of harm linked to actions concerning (in)justice. Although the starting point is Aristotelian practical philosophy, in this research this perspective is extended and criticised. Once a first approach to the object of the study (the harm that results for others from the agent's action or omission) has been defined, a classification of the types of harm will be established. In doing so, it will be shown where the Stagirite's proposition needs to be expanded, (...) qualified, and even corrected. In particular, a commonly overlooked element will be highlighted: that the most perverse effect of an injustice is to make the one who commits it unjust. (shrink)