This paper explores the concept of sustainable e-learning. It outlines a scoping review of the sustainability of e-learning practice in higher education. Prior to reporting the outcomes of the review, this paper outlines the rationale for conducting the study. The origins and the meaning of the term "sustainability" are explored, and prevalent approaches to ensure sustainable e-learning are discussed. The paper maps the domains of the research area and concludes by suggesting directions for future research that would improve current understanding of key factors affecting the sustainability of e-learning practice to develop a more coherent body of knowledge.