As a qualitative research method, case study was used in the research carried out to investigate the causes of conflicts in schools, levels and type of conflict, effects of conflict, methods used to solve conflicts. 40 teachers working in 3 elementary schools, 2 middle schools and 2 high schools in Yeniçaga district of Bolu, Turkey which constituted the research group of the study, were determined using the criterion sampling technique within the scope of convenience sampling and purposive sampling method. The data were collected through interviews and semistructured interview form and analyzed with content analysis. A medium-level conflict in schools will yield positive results in terms of individual and organizational aspects and therefore increase the effectiveness of schools when considering the positive effects and consequences of conflicts in schools. However, since the increase in the level of conflict can lead to negative individual, interpersonal and organizational outcomes, both teachers and school administrators at schools should have a broad knowledge of conflict and good conflict management skills. In addition, conflict information will minimize the individual, interpersonal and administrative reasons that reveal the conflict. The current study finds the following important and striking results: teachers' weariness and tiredness as a result of conflict, burnout, unwillingness to work, decrease in work efficiency and performance, decrease in organizational commitment, stress and anxiety, loneliness, unhappiness, cynicism, decrease in motivation, unwillingness to come to school, wanting to leave school, disappearance of ethical behaviors, withdrawal, and anger. Besides, one of the most important results of the study is to reveal some elements such as effective communication, fulfillment of duties and responsibilities in a timely manner, organizational fit, behavior of teachers and administrators in accordance with the rules of professional ethics and business ethics, teamwork and cooperation in schools which have no conflict.