The aim of this research is to gain insight into the reactions of observers of peer violence, with the aim of reducing or preventing peer violence in and outside schools. The survey was conducted with students observers of peer violence of the 7th grade of the elementary school Dragojle Jarnević in Karlovac. The sample that was used was a deliberate sample and there was 18 participants who participated in the study. The research was conducted through two focus groups, using the vignette. The results showed possible ways of responding to peer violence from the observers perspective, such as victim protection, reporting of violence, talk with those involved in violence, attachment to the violator, and observation of violence, and different ways of responding by teachers. A good relationship with the victim, the importance of responding but also of the violence of less intensity, joining others in reacting to violence, empathy, and extrinsic motives are the circumstances that motivate the observers reaction to peer violence. Circumstances that prevent observers reactions are: fear of the perpetrators, reducing the importance of responding to violence, the belief that there will be no support from teachers/ adults, fear of bringing consequences, egocentric perspective and negative perception of the victim. Students, their parents, teachers and other adults need to be aware of the importance of the role of observers in preventing peer violence, and to educate them on the possibilities of dealing with peer violence.