This study examines relationships between religiosity and value orientation of teachers, and preference for whistleblowing modes. Three hypotheses were developed, and tested related to the relationships between utilitarianism, religiosity, Machiavellianism and preference for various forms of whistleblowing. To analyse the data obtained from a sample of 271 teachers in Turkey, descriptive statistics, Pearson correlation test, and regression analysis were used. According to the results, teachers prefer internal and identified whistleblowing. Religiosity affects teachers' preference for internal reporting in a positive way, while Machiavellianism and utilitarianism do not. No relationship was found between the teachers' values and preference for modes of whistleblowing. Examining religiosity, ethical ideology and whistleblowing in an education context in Turkey, this study contributes an Islamic perspective to the literature concerning whistleblowing.