The cross-border movement of people in higher education has been attracting scholarly attention for decades, but the definition of 'international academic mobility' bears ambiguities. This article reviews the literature on international academic mobility published in the journal "Higher Education" and beyond. By bridging the literature on international academic mobility from higher education studies and other disciplines, this article proposes to redefine international academic mobility, which highlights the integration of both international student mobility and international faculty mobility. Furthermore, this article outlines a new conceptual framework and research agenda, on the role of international academic mobility in the national, regional, and global knowledge systems. The framework highlights the relationship between international academic mobility and worldwide knowledge acquisition, production, transfer, circulation, networks, and the geopolitics of science. The article also proposes further methodologies for future research on international academic mobility.