This input paper presents a number of key issues and findings from recent literature on school leadership on sustainability and aims to open discussion on possible policy action in this area. For the purposes of this paper, school leaders are defined as holding a formal position of responsibility for the management of the school. School leaders are also teachers, as they are also still involved in learner development, both in and out of the classroom. 'School head' is the most senior school leadership position -- the person with overall responsibility for the pedagogical and administrative management of the school or cluster of schools. This role might also be referred to as 'head teacher', 'school principal' or 'school director'. They can also be included in the broad definition of 'school leader'.