Permissible risk (Abstract) Topic of this thesis is permissible risk which is one of circumstances excluding the illegality in czech law. Text is divided into eight main parts. In first chapters history of permissible risk and circumstances excluding the ellegality are explained, then the relation between them is being discused. After first chapters that are about permissible risk in general, special parts come - permissible risk in health service, sports and economy. In each of this fields same topics are considered - special subject, acting lege artis, common good and relation between risk and the goal expected. Last part of this theses summons circumstances of permissible risk and asks a question whether it is necessary to have permissible risk in czech penal code.