The police is the central service of the Ministry of the Internal Affairs, that performs a wide range of tasks defined by laws and regulations. The advancement system is divided into automatic and open systems. In the automatic system, an officer advances based on objective criteria such as passing various exams or gaining sufficient years of work experience, while in the open system, an officer advances based on job-specific competencies, such as the results achieved during the performance of their duties. In Croatia, the advancement system within police services is organized according to job performance, expertise, and continuous professional development of police personnel. In many countries, advancement systems are designed to be based on a combination of professional qualifications, length of service, and work performance, which is key to ensuring fairness and motivating officers. The aim of the paper is to compare the promotion process in the Croatian police with that in the German and French police, with the work being based on a comparative analysis. In Croatia, the police advancement system should be based on clear and transparent criteria, including continuous training, and emphasis should also be placed on specialization and education, as this would allow for greater flexibility and advancement within the police force.