This study situates Green's educational philosophy and practice in the context of his overall approach to philosophy. In Green's view, education should aim at the realisation of the common good, but what Green means by this term is closely connected to his views on human nature, ethical endeavour and indeed the evolution of human history. These ideas are central to his main philosophical works. For Green the common good is to be found in the achievement of qualities of mind or character which involve the individual making the best of himself/herself. The content of education and particularly the development of reason assist centrally in this process. Access to resources and education are important conditions for achieving the common good, but since they involve scarce resources and competition for them, they are not part of the common good as such. The paper goes on to link these ideas with Green's account of citizenship and his involvement with school and university education in Oxford.