This research examines supervisional deviant behaviours depending on the primary school teachers' view in Izmir, Turkey. Organizational or workplace deviant behaviours have been studied in number of studies and these types of behaviours are determined. It is obvious that solving the problems of orgaizational deviance contribute to meet organizational objectives. Since the supervision process which aims at revealing the realization level of organizational goals is one of the important part of organizations, determining and solving the problems of supervisional deviant behaviours can also contribute to meet the targets. Therefore this study is organized to determine supervisional deviant behaviours in supervision process depending on the primary school teachers' opinions. Qualitative research was conducted in this study. Extreme-end sampling was used as a procedure of data collection. MAXQDA10.1 data analysis programme is used to anlayze the data. According to research findings supervisional deviant behaviours are observed in Turkish primary schools and supervisional deviance is influenced by three themes namely "supervisors' individual deviant behaviours", "deviant behaviours resulted from supervisors inabilities" and "supervisors unethical deviant behaviours". Consequently, educational system should take some measures to overcome the negative effects of supervisional deviant behaviours for better learning outcomes.