Good writing presents voice in the written text. Unfortunately, students with extroversion personality, who perceived to have strong sense in positioning themselves, got less attention in many research of EFL writing. This research is aimed at finding out the authorial voice in argumentative writing of fourth semester students with extroversion personality, English Education at UIN Walisongo Semarang. This research used qualitative method with some stages in collecting the data. First, the students did personality test to select students with extroversion personality, who were then recruited as the participants of the research. Second, the main data were 35 argumentative writings which were collected through documentation. Then the data were analyzed by using Hyland’s Interactional Model of Voice which consisted of stance and engagement. The finding showed that their authorial voice is on the scale 1,52 which means the reader feels a somewhat weak sense of authorial voice and writing with strong voice is even harder for second language writers. This research implied pedagogical significance on the needs of students' consideration in learning and comprehending the concept of voice in order to improve the quality of their writing.