This book presents to the readers the outline of the basic principles of Polish criminal law. In the general part, it discusses the fundamental institutions, including penalties, penal, probation and security measures. The main types of crimes in the special part of the Polish Penal Code are also presented. Thanks to this approach, the foreign reader can get to know the system of Polish criminal law. The book will be useful not only for those who scientifically deal with comparative research in the field of criminal law, but also for foreign solicitors, judges and prosecutors who will come into contact with Polish criminal law in their daily work.