Criminal law is defined as the law of repression of offences or as the set of rules whose purpose is to determine antisocial acts, to designate the persons who can be declared responsible and to fix the penalties applicable to them. Criminal law is therefore one of the prerogatives of public power whose purpose is to punish. It is therefore repressive before being preventive. It applies to an individual, understood as a person who must answer for his or her actions, or to a community through the repression of a certain number of offences committed in an organized gang, for example. This book aims to present, in a synthetic and structured way, all the knowledge that a student or a candidate to the administrative competitions must have on the Criminal Law. Criminal law is intended to be the voice of the wise who whisper and tend to remind us that each of us is responsible for his acts before the law and that no contravention, no misdemeanor and even worse, no crime can go unpunished.