Opinions of teachers on organizational dissent were investigated in the present study. The population of the study consisted of 6449 teachers working in 134 public high schools in the central districts of Ankara. To determine the sample, 'stratified sampling technique' was used and the sample was composed of 381 teachers. 'Organizational Dissent Scale-ODS' developed in the present study was administered to the sample. The data were collected in the academic years of 2009-2010 and were analyzed with arithmetical mean, standard deviations, frequencies and t-test using SPSS Statistical Packages for Social Sciences (SPSS). It was found out in the research that dissent behaviors of the teachers were triggered by the unethical, illegal and bullying attitudes of the school administrators. The most common dissent behavior of the teachers was to object their administrators directly. In addition, it was found that school administrators suppress dissenters and also dissent affects administrators negatively. However, it was seen that dissent had some positive effects on various organizational processes like self-control, democracy, justice and organizational renewal.