Education is in the midst of massive reforms in different parts of the world. Over the last few decades, there is an increasing call for global citizenship education(GCE) in the academy. In this paper, the author will first explain why the concept is a game changer in higher education, and then explorethe opportunities as well challenges for GCE, particularly in the Hong Kong academy, from the perspectives of public policies, curriculum and pedagogy. Finally, the author wants to explore how the pedagogy of service learning (SL) can serve as a powerful vehicle to achieve the intended learning outcomes of GCE while, in the meantime, GCEcan inform the theory and practice of international SL.