Prison aftercare is an important factor in the prevention of crime because it encompasses all aspects of preparing prisoners for release and reintegration into society, so that they can live in freedom in accordance with the law. This paper covers the importance of prison aftercare for the prevention of criminal recidivism and the importance of cooperation between different systems and non-governmental organizations involved in prison aftercare in the Republic of Croatia. When released, prisoners are faced with problems such as unemployment and homelessness, as well as a lack of information about facilities that can help them solve these problems. The challenges they face are multi-faceted and can influence re-offending. It is the task of all institutions and non-governmental organizations to cooperate together and inform prisoners in a timely and quality manner about the services and opportunities offered to them in the territory of the Republic of Croatia. As part of the work, a draft of the research Prisoners knowledge on the possibilities of the prison aftercare was proposed with the aim of examining the information of ex-prisoners about the services and facilities available to them in the area of the City of Zagreb, Zagrebačka and Krapinsko-zagorska counties. The aim of this paper is to show the possibilities of post-criminal protection, with an emphasis on the challenges and problems faced by prisoners, and to contribute to the improvement of the quality of the organization of prison aftercare by implementing the proposed research.