Theoretical part of this paper defines violence, describes the types of violence and the violence prevention. In order to understand the problem of violence against and among children and the youth it is important to describe basic characteristics of development periods in childhood and adolescence. The violence prevention programs and projects against and among children and the youth implemented in the Republic of Croatia with the emphasis on the program Violence prevention in youthful relationships, continuously implemented since 2009 in all counties of the Republic of Croatia will be described. The aim of this paper was to implement the program Violence prevention in youthful relationships in local community of the town Gospić and evaluate the efficiency of the program. The program was implemented in the academic year 2017/2018 with third-year students from the Department of Educational Studies in Gospić University of Zadar and third-year pupils from Grammar School Gospić. The program was realized in a way that first the students educated and prepared themselves for workshops in classrooms with pupils and then they held four workshops with the third-year pupils from Grammar School. The program evaluation was made based on 25 pupils’ questionnaires as program users and 16 students’ questionnaires as program managers. The evaluation showed that the pupils rated the program very high according to the criteria of interest and usefulness, and the students expressed their extremely positive experience of pupils’ interest and cooperation and that they successfully gained the experience for their future teacher vocation.