The notion of "student citizen" is implicit in a range of national and provincial policy documents in South Africa, with citizenship promoted as both an expected outcome of schooling and an encouraged practice within schools. This paper provides an account of how policy on student citizenship was translated differently into practice in four secondary schools in Cape Town, each with a different former racial categorisation under apartheid. It argues that student engagement with citizenship varied considerably between the schools and in many cases was significantly different from the policy framework. Influencing factors included staff-student relations, socio-historical contexts and how diversity was played out in the schools. (Contains 10 notes and 2 tables.)