The acknowledgement section in a thesis or dissertation expresses gratitude for the people who have helped the author in the process of conducting the research and writing the paper. The study sought to explore the extent to which metadiscourse markers have been employed in the dissertation acknowledgements. Excluding the rhetorical moves, emotional tones and cultural backgrounds, the research has primarily contrasted dissertation acknowledgements written by Iranian EFL doctoral graduates and English native speakers at an identical level. Hyland's metadiscourse model features and his four-tier main obligatory thanking move was applied to determine and interpret the features predominantly used in the thesis acknowledgements. A qualitative analysis of the results revealed that except for a meaningful difference in attitude markers, Iranian acknowledgements were consistent with the model and not any noticeable difference detected in using interactive metadiscourse features between Iranians and native speakers when writing their dissertation acknowledgements.