The focus in this paper is on a student voice initiative at an English secondary school designed to improve the quality of teaching and learning. The initiative invites Year 8 students to train and work as "lesson observers" who provide feedback to teachers about their practice. The possibilities of this initiative to reflect a rich and intelligent form of teacher accountability are explored in relation to its capacity to (1) enhance students' understanding and appreciation of teachers, teaching and the learning process; (2) support students to work in partnership with teachers to improve pedagogy and relationships; and (3) develop students' positive self-image as learners. In its exploration of this initiative the paper also considers matters of authenticity, inclusion and power and highlights ways in which student voice initiatives can be undermined when these matters are not adequately engaged with. Such engagement, it is argued, is imperative in guarding against a misappropriation or undermining of student voice to align with traditional teacher-student power relations or to fit with the dictates of school improvement as framed by narrow and reductive measures.