This study aims to develop a structural model for organizational citizenship behavior, group cohesiveness and workplace deviance behavior. The study group consists of 639 Turkish teachers working in primary and secondary public schools. In the study, the "Organizational Citizenship Behavior Scale" and the "Group Cohesiveness Scale" developed by the researchers and the "Workplace Deviance Scale" developed by Bennett and Robinson (2000) were used. The hypotheses proposed were tested with structural equation modeling (SEM). The results of the study show that organizational citizenship behavior reduces workplace deviance, while it increases group cohesiveness. Conversely, workplace deviance increases group cohesiveness. The results of the study could be beneficial to those wishing to understand the relationship between organizational citizenship behavior, group cohesiveness and workplace deviance in educational settings.