Student voice is a concept and a set of approaches that position students alongside credentialed educators as critics and creators of educational practice. Student voice and student agency are closely linked when school stakeholders connect the sound of students speaking with students having the power to influence analyses of, decisions about, and practices in schools. In this article I present an overview of forms of student voice work that support cultivating student agency in school spaces, in research on teaching and learning in those spaces, and in authoring publications about teaching and learning in those spaces. Drawing on empirical studies conducted in a range of contexts, the examples refer to students, teachers, administrators, and researchers working together to: analyze teaching and learning in ways that inform classroom practices; employ a wide variety of methodologies to engage in research that leads to action; and author and co-author analyses of practice and research that are guided by students' own interpretative frames as well as filled with their own words. Implications of this discussion include suggestions for teachers, school principals, teacher educators, and researchers regarding how to support student voice such that it fosters the developent of student agency.