Academic writing is not just about presenting a set of ideas, but through the act of writing, the authors position themselves as individuals having particular identities which mostly reflect the dominant sociocultural values and practices of the discourse communities in which they are living and performing. The present study, using a mixed method approach, attempted to explore the evidences of voice and subject positioning, as reflections of authorial identity, in the argumentative writings of 41 advanced Iranian EFL learners. At first, the relationship between voice intensity and overall writing quality of the participants was assessed and the results indicated a positive relationship between the constructs. The multiple regression analysis conducted also revealed that assertiveness, as one of the main subcomponents of voice in writing, had the highest level of contribution in accounting for the writing competence of the learners. Afterwards, some representative instances of subject-positioning (i.e., ideational, interpersonal and textual) in the written texts were identified and discussed based on the ideological context of the study since it is believed that authorial identity and voice can vividly reflect the overall ideology of the specific discourse community in which they are constructed. Finally, it was suggested that raising the awareness of learners and even instructing them about the significance of authorial identity, voice and subject-positioning in writing can assist them in constructing more authentic texts in terms of idea presentation, consideration of readers and specific textual and linguistic features used.