A research on attitudes, recognition and understanding of gender based violence in adolescents? relationships, has been conducted, through focused group discussions and questionnaire. 612 adolescents from 22 secondary schools in the Republic of Croatia have answered the questionnaire. The research findings indicate that about 60% of young people have experienced certain form of violence in a relationship, and 43% of them state that they have behaved in violent way within a relationship. 87% of young women and 57% of young men regard that dating violence within adolescents? relationships is serious problem. Numerous data point out the need for including gender perspective in programmes of violence prevention among youth. For example, every fourth young men regards that the girl is expected to agree to sexual intercourse with young man who has spent significant amount of money during the date. 28% of young men and 8% of young women regard that when women say NO they think YES. 25% of young men and 12% of young women do not consider that forcing person to sexual intercourse is violent behaviour. 51% of young men and 31% of young women think that women should be careful not to provoke men. Research results were used in creating prevention programme and within campaign.