The present study used quantitative and qualitative measures to examine Iranian applied linguists' (mis-) conceptions of ethical issues in research. For this purpose, one hundred and twelve applied linguists completed a research ethics questionnaire constructed and validated by the researchers. In the follow-up qualitative phase, 15 applied linguists who were faculty members participated in semi-instructed interviews. Data were analyzed using exploratory factors analyses for the first phase and theme analyses for the second phase. Quantitative results showed that the most important misconceptions among Iranian applied linguists lingered on working with data (data collection and data analyses). For example, removing an outlier was a prevalent act conducted by applied linguists in the present study. Teachers using their students as participants of their own research as well as how they treated those students after a study were other controversial issues. The qualitative results revealed several themes including "lack of knowledge, conflict with real-world practices, a product-oriented approach to education and a publish or perish mentality" as the reasons for misconceptions of ethics in applied linguistics among Iranian researchers. On general terms, there was an implicit agreement regarding the lack of training on research ethics among Iranian applied linguists.