This study firstly aims at specifying and presenting the frequency of different types of rhetorical moves employed in ESP book reviews, and then highlighting the importance of comprehending genre knowledge of the profession that ELT postgraduate students will set out in future, as this knowledge is essential to their professional career. With this in mind, 12 ESP book reviews (N = 12) from the most appreciated academic journals were randomly selected. The results of the study have indicated that all the analysed ESP book reviews include specific steps from rhetorical moves such as defining the general topic of the book, providing a general view of the organization of the book, providing focused evaluation, finding the book useful, etc., while some group of move steps are not included in some reviews. Besides, lexis, particularly keywords, and grammar structures are seen to be included at different frequencies in the study. ELT instructors may benefit from the findings of this study in their genre-based writing courses. [This paper was published in: "IRCEELT 2016: The 6th International Research Conference on Education, Language and Literature Conference Proceedings" (Tbilisi, Georgia, April 22-23, 2016). p604-616. ISSN 2298-0180.]