The objective of the investigation was to analyze some international experience in assessing the effectiveness of law enforcement in crime prevention. Methodologically, the dialectic method, typical of materialistic philosophy, was combined with scientific techniques of cognition. It is concluded that the basis for assessing the effectiveness of law enforcement agencies in different countries is based on a set of quantitative and qualitative criteria; sometimes such criteria conflict with each other, as some are beneficial for bureaucratic reporting, while others reflect the public's interests. Public opinion, as one of the main criteria, is becoming increasingly important in assessing the effectiveness of law enforcement agencies in some countries (e.g., the Slovak Republic), and in the US, France, Japan, Austria, and Italy, it is a traditional evaluation tool. Ambiguous is the use of statistics to assess the effectiveness of law enforcement in certain countries and Finally, there are countries where criminal statistics are a priority to determine the effectiveness of law enforcement and in others not.