This study explored Bangladeshi science teachers' conceptions of nature of science (NOS) with a particular focus on the nature of (a) scientific knowledge, (b) scientific inquiry and (c) scientific enterprise. The tentative, inferential, subjective and creative NOS, in addition to the myths of the scientific method and experimentation, the nature of scientific laws and theories, the social and cultural embeddedness, and cooperation and collaboration in science were considered in the conceptual framework. Both quantitative and qualitative data were collected concurrently using the Myths of Science Questionnaire (MOSQ) from 145 science teachers. Results showed that the majority of the teachers in this study held uninformed conceptions about most of the target NOS aspects. Also, an inconsistent response pattern was revealed in teachers' response to the aspects directly related NOS. The results suggest that further research is required to better understand how Bangladeshi teachers model NOS in their classes and how the pedagogies of teacher education inform this modelling. (Contains 3 tables.)