The present study aimed at providing a typology of Iranian supervisors’ written feedback on L2 graduate students’ theses/dissertations and examining the way different speech functions are employed to put the supervisors’ thoughts and feelings into words. In so doing, a corpus of comments, including 15,198 comments provided on 87 TEFL theses and dissertations by 30 supervisors were analyzed. We employed an inductive category formation procedure to form the typology of comments, and followed a deductive procedure to put the comments into the three categories of expressive, referential, and directive speech functions. The findings showed that supervisors provided seven main categories of comments on theses and dissertations: grammar and sentence structure, content, method, organization, references, formatting, and academic procedures. Furthermore, the findings indicated that supervisors employed comments with different patterns and for different purposes on MA and PhD students’ texts.
